231165561131 has 8 divisors (see below), whose sum is σ = 232790144400. Its totient is φ = 229541953312.

The previous prime is 231165561089. The next prime is 231165561161. The reversal of 231165561131 is 131165561132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231165561131 - 2²² = 231161366827 is a prime.

It is a super-2 number, since 2×231165561131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231165561091 and 231165561100.

It is not an unprimeable number, because it can be changed into a prime (231165561161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235061 + ... + 719433.

It is an arithmetic number, because the mean of its divisors is an integer number (29098768050).

Almost surely, 2^231165561131 is an apocalyptic number.

231165561131 is a deficient number, since it is larger than the sum of its proper divisors (1624583269).

231165561131 is a wasteful number, since it uses less digits than its factorization.

231165561131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487725.

The product of its digits is 16200, while the sum is 35.

Subtracting from 231165561131 its reverse (131165561132), we obtain a palindrome (99999999999).

The spelling of 231165561131 in words is "two hundred thirty-one billion, one hundred sixty-five million, five hundred sixty-one thousand, one hundred thirty-one".