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102690901 = 585117551
BaseRepresentation
bin1100001111011…
…11000001010101
321011020020102201
412013233001111
5202242102101
614105004501
72354600245
oct607570125
9234206381
10102690901
1152a6a215
122a483731
1318376561
14d8d1b25
159036e01
hex61ef055

102690901 has 4 divisors (see below), whose sum is σ = 102714304. Its totient is φ = 102667500.

The previous prime is 102690899. The next prime is 102690919. The reversal of 102690901 is 109096201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 109096201 = 619917599.

It is a 3-Lehmer number, since φ(102690901) divides (102690901-1)3.

It is a cyclic number.

It is not a de Polignac number, because 102690901 - 21 = 102690899 is a prime.

It is a super-2 number, since 2×1026909012 = 21090842296383602, which contains 22 as substring.

It is a deceptive number, since it divides R102690900.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102690901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102690961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2925 + ... + 14626.

It is an arithmetic number, because the mean of its divisors is an integer number (25678576).

It is a Poulet number, since it divides 2102690900-1.

Almost surely, 2102690901 is an apocalyptic number.

102690901 is the 5851-st octagonal number.

It is an amenable number.

102690901 is a deficient number, since it is larger than the sum of its proper divisors (23403).

102690901 is an equidigital number, since it uses as much as digits as its factorization.

102690901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23402.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 102690901 is about 10133.6519083695. The cubic root of 102690901 is about 468.2854399282.

The spelling of 102690901 in words is "one hundred two million, six hundred ninety thousand, nine hundred one".

Divisors: 1 5851 17551 102690901