261546610131 has 12 divisors (see below), whose sum is σ = 381457409008. Its totient is φ = 172671547824.

The previous prime is 261546610037. The next prime is 261546610177. The reversal of 261546610131 is 131016645162.

261546610131 is a `hidden beast` number, since 2 + 6 + 1 + 5 + 4 + 6 + 610 + 1 + 31 = 666.

It is not a de Polignac number, because 261546610131 - 2²¹ = 261544512979 is a prime.

It is a super-2 number, since 2×261546610131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261546610231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141070600 + ... + 141072453.

Almost surely, 2^261546610131 is an apocalyptic number.

261546610131 is a deficient number, since it is larger than the sum of its proper divisors (119910798877).

261546610131 is a wasteful number, since it uses less digits than its factorization.

261546610131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282143162 (or 282143159 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 261546610131 in words is "two hundred sixty-one billion, five hundred forty-six million, six hundred ten thousand, one hundred thirty-one".