231871610816 has 28 divisors (see below), whose sum is σ = 469910025888. Its totient is φ = 113469084672.

The previous prime is 231871610813. The next prime is 231871610819. The reversal of 231871610816 is 618016178132.

It is an interprime number because it is at equal distance from previous prime (231871610813) and next prime (231871610819).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231871610813) 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, 38539481 + ... + 38545496.

Almost surely, 2^231871610816 is an apocalyptic number.

It is an amenable number.

231871610816 is an abundant number, since it is smaller than the sum of its proper divisors (238038415072).

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

231871610816 is an equidigital number, since it uses as much as digits as its factorization.

231871610816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77085036 (or 77085026 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 44.

Adding to 231871610816 its reverse (618016178132), we get a palindrome (849887788948).

The spelling of 231871610816 in words is "two hundred thirty-one billion, eight hundred seventy-one million, six hundred ten thousand, eight hundred sixteen".