231979313 has 4 divisors (see below), whose sum is σ = 234915840. Its totient is φ = 229042788.

The previous prime is 231979277. The next prime is 231979339. The reversal of 231979313 is 313979132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231979313 - 2⁸ = 231979057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231979373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1468145 + ... + 1468302.

It is an arithmetic number, because the mean of its divisors is an integer number (58728960).

Almost surely, 2^231979313 is an apocalyptic number.

It is an amenable number.

231979313 is a deficient number, since it is larger than the sum of its proper divisors (2936527).

231979313 is an equidigital number, since it uses as much as digits as its factorization.

231979313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2936526.

The product of its digits is 30618, while the sum is 38.

The square root of 231979313 is about 15230.8671125448. The cubic root of 231979313 is about 614.4451010833.

The spelling of 231979313 in words is "two hundred thirty-one million, nine hundred seventy-nine thousand, three hundred thirteen".