231871512 has 16 divisors (see below), whose sum is σ = 579678840. Its totient is φ = 77290496.

The previous prime is 231871511. The next prime is 231871513. The reversal of 231871512 is 215178132.

It is an interprime number because it is at equal distance from previous prime (231871511) and next prime (231871513).

It is a super-2 number, since 2×231871512² = 107528796154332288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231871512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231871511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4830633 + ... + 4830680.

Almost surely, 2^231871512 is an apocalyptic number.

It is an amenable number.

231871512 is an abundant number, since it is smaller than the sum of its proper divisors (347807328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231871512 is a wasteful number, since it uses less digits than its factorization.

231871512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9661322 (or 9661318 counting only the distinct ones).

The product of its digits is 3360, while the sum is 30.

The square root of 231871512 is about 15227.3278023427. The cubic root of 231871512 is about 614.3499086020.

The spelling of 231871512 in words is "two hundred thirty-one million, eight hundred seventy-one thousand, five hundred twelve".