231696561 has 8 divisors (see below), whose sum is σ = 310546944. Its totient is φ = 153655280.

The previous prime is 231696557. The next prime is 231696589. The reversal of 231696561 is 165696132.

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 231696561 - 2² = 231696557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231696541) 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, 201606 + ... + 202751.

It is an arithmetic number, because the mean of its divisors is an integer number (38818368).

Almost surely, 2^231696561 is an apocalyptic number.

It is an amenable number.

231696561 is a deficient number, since it is larger than the sum of its proper divisors (78850383).

231696561 is a wasteful number, since it uses less digits than its factorization.

231696561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404551.

The product of its digits is 58320, while the sum is 39.

The square root of 231696561 is about 15221.5820794029. The cubic root of 231696561 is about 614.1953572395.

The spelling of 231696561 in words is "two hundred thirty-one million, six hundred ninety-six thousand, five hundred sixty-one".