31131251120 has 40 divisors (see below), whose sum is σ = 72569212416. Its totient is φ = 12419975168.

The previous prime is 31131251083. The next prime is 31131251131. The reversal of 31131251120 is 2115213113.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31131251092 and 31131251101.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 477377 + ... + 538656.

Almost surely, 2^31131251120 is an apocalyptic number.

It is an amenable number.

31131251120 is an abundant number, since it is smaller than the sum of its proper divisors (41437961296).

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

31131251120 is a wasteful number, since it uses less digits than its factorization.

31131251120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016429 (or 1016423 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 20.

Adding to 31131251120 its reverse (2115213113), we get a palindrome (33246464233).

The spelling of 31131251120 in words is "thirty-one billion, one hundred thirty-one million, two hundred fifty-one thousand, one hundred twenty".