231320156 has 12 divisors (see below), whose sum is σ = 428622768. Its totient is φ = 108856512.

The previous prime is 231320149. The next prime is 231320161. The reversal of 231320156 is 651023132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1700816 + ... + 1700951.

It is an arithmetic number, because the mean of its divisors is an integer number (35718564).

Almost surely, 2^231320156 is an apocalyptic number.

It is an amenable number.

231320156 is a deficient number, since it is larger than the sum of its proper divisors (197302612).

231320156 is a wasteful number, since it uses less digits than its factorization.

231320156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3401788 (or 3401786 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 231320156 is about 15209.2128658915. The cubic root of 231320156 is about 613.8625778671.

Adding to 231320156 its reverse (651023132), we get a palindrome (882343288).

The spelling of 231320156 in words is "two hundred thirty-one million, three hundred twenty thousand, one hundred fifty-six".