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10101661 = 61165601
BaseRepresentation
bin100110100010…
…001110011101
3201000012212121
4212202032131
510041223121
61000302541
7151601623
oct46421635
921005777
1010101661
11577a589
123471a51
132128c1b
1414ad513
15d48141
hex9a239d

10101661 has 4 divisors (see below), whose sum is σ = 10267324. Its totient is φ = 9936000.

The previous prime is 10101659. The next prime is 10101697. The reversal of 10101661 is 16610101.

10101661 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3976036 + 6125625 = 1994^2 + 2475^2 .

It is a cyclic number.

It is not a de Polignac number, because 10101661 - 21 = 10101659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10101361) 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, 82740 + ... + 82861.

It is an arithmetic number, because the mean of its divisors is an integer number (2566831).

Almost surely, 210101661 is an apocalyptic number.

It is an amenable number.

10101661 is a deficient number, since it is larger than the sum of its proper divisors (165663).

10101661 is an equidigital number, since it uses as much as digits as its factorization.

10101661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165662.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 10101661 is about 3178.3110294620. The cubic root of 10101661 is about 216.1710821660.

Adding to 10101661 its reverse (16610101), we get a palindrome (26711762).

The spelling of 10101661 in words is "ten million, one hundred one thousand, six hundred sixty-one".

Divisors: 1 61 165601 10101661