231520979 has 8 divisors (see below), whose sum is σ = 235428240. Its totient is φ = 227627136.

The previous prime is 231520969. The next prime is 231521009. The reversal of 231520979 is 979025132.

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 231520979 - 2⁴ = 231520963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231520969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35087 + ... + 41159.

It is an arithmetic number, because the mean of its divisors is an integer number (29428530).

Almost surely, 2^231520979 is an apocalyptic number.

231520979 is a deficient number, since it is larger than the sum of its proper divisors (3907261).

231520979 is an equidigital number, since it uses as much as digits as its factorization.

231520979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6709.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 231520979 is about 15215.8134518007. The cubic root of 231520979 is about 614.0401702119.

The spelling of 231520979 in words is "two hundred thirty-one million, five hundred twenty thousand, nine hundred seventy-nine".