31871994120 has 96 divisors (see below), whose sum is σ = 107155877400. Its totient is φ = 8206119936.

The previous prime is 31871994113. The next prime is 31871994131. The reversal of 31871994120 is 2149917813.

It can be written as a sum of positive squares in 4 ways, for example, as 28931968836 + 2940025284 = 170094^2 + 54222^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1515997 + ... + 1536876.

Almost surely, 2^31871994120 is an apocalyptic number.

31871994120 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31871994120 is an abundant number, since it is smaller than the sum of its proper divisors (75283883280).

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

31871994120 is a wasteful number, since it uses less digits than its factorization.

31871994120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3052919 (or 3052912 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The spelling of 31871994120 in words is "thirty-one billion, eight hundred seventy-one million, nine hundred ninety-four thousand, one hundred twenty".