231312639 has 8 divisors (see below), whose sum is σ = 308752560. Its totient is φ = 154040576.

The previous prime is 231312619. The next prime is 231312643. The reversal of 231312639 is 936213132.

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 231312639 - 2¹² = 231308543 is a prime.

It is a super-2 number, since 2×231312639² = 107011073922288642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231312619) 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, 38712 + ... + 44285.

It is an arithmetic number, because the mean of its divisors is an integer number (38594070).

Almost surely, 2^231312639 is an apocalyptic number.

231312639 is a deficient number, since it is larger than the sum of its proper divisors (77439921).

231312639 is an equidigital number, since it uses as much as digits as its factorization.

231312639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83929.

The product of its digits is 5832, while the sum is 30.

The square root of 231312639 is about 15208.9657439288. The cubic root of 231312639 is about 613.8559284177.

The spelling of 231312639 in words is "two hundred thirty-one million, three hundred twelve thousand, six hundred thirty-nine".