31539501940 has 48 divisors (see below), whose sum is σ = 70143700032. Its totient is φ = 11871207936.

The previous prime is 31539501913. The next prime is 31539501941. The reversal of 31539501940 is 4910593513.

It is a junction number, because it is equal to n+sod(n) for n = 31539501893 and 31539501902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31539501941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2865127 + ... + 2876113.

It is an arithmetic number, because the mean of its divisors is an integer number (1461327084).

Almost surely, 2^31539501940 is an apocalyptic number.

It is an amenable number.

31539501940 is an abundant number, since it is smaller than the sum of its proper divisors (38604198092).

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

31539501940 is a wasteful number, since it uses less digits than its factorization.

31539501940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19456 (or 19454 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 40.

The spelling of 31539501940 in words is "thirty-one billion, five hundred thirty-nine million, five hundred one thousand, nine hundred forty".