231688961 has 8 divisors (see below), whose sum is σ = 265275840. Its totient is φ = 198224208.

The previous prime is 231688949. The next prime is 231688969. The reversal of 231688961 is 169886132.

231688961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-231688961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231688969) 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, 26426 + ... + 34083.

It is an arithmetic number, because the mean of its divisors is an integer number (33159480).

Almost surely, 2^231688961 is an apocalyptic number.

It is an amenable number.

231688961 is a deficient number, since it is larger than the sum of its proper divisors (33586879).

231688961 is an equidigital number, since it uses as much as digits as its factorization.

231688961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61063.

The product of its digits is 124416, while the sum is 44.

The square root of 231688961 is about 15221.3324318208. The cubic root of 231688961 is about 614.1886416518.

The spelling of 231688961 in words is "two hundred thirty-one million, six hundred eighty-eight thousand, nine hundred sixty-one".