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10101001 = 43234907
BaseRepresentation
bin100110100010…
…000100001001
3201000011222011
4212202010021
510041213001
61000255521
7151566661
oct46420411
921004864
1010101001
11577a039
1234715a1
132128831
1414ad1a1
15d47d51
hex9a2109

10101001 has 4 divisors (see below), whose sum is σ = 10335952. Its totient is φ = 9866052.

The previous prime is 10100999. The next prime is 10101023. The reversal of 10101001 is 10010101.

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.

It is a cyclic number.

It is not a de Polignac number, because 10101001 - 21 = 10100999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10101101) 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, 117411 + ... + 117496.

It is an arithmetic number, because the mean of its divisors is an integer number (2583988).

Almost surely, 210101001 is an apocalyptic number.

It is an amenable number.

10101001 is a deficient number, since it is larger than the sum of its proper divisors (234951).

10101001 is an equidigital number, since it uses as much as digits as its factorization.

10101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234950.

The product of its (nonzero) digits is 1, while the sum is 4.

The square root of 10101001 is about 3178.2071990353. The cubic root of 10101001 is about 216.1663741607.

Adding to 10101001 its reverse (10010101), we get a palindrome (20111102).

Multiplying 10101001 by its reverse (10010101), we get a palindrome (101112040211101).

It can be divided in two parts, 1010100 and 1, that added together give a palindrome (1010101).

The spelling of 10101001 in words is "ten million, one hundred one thousand, one".

Divisors: 1 43 234907 10101001