31503013000 has 64 divisors (see below), whose sum is σ = 74255454000. Its totient is φ = 12509171200.

The previous prime is 31503012943. The next prime is 31503013013. The reversal of 31503013000 is 31030513.

It can be written as a sum of positive squares in 8 ways, for example, as 341584324 + 31161428676 = 18482^2 + 176526^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22026 + ... + 251974.

Almost surely, 2^31503013000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31503013000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37127727000).

31503013000 is an abundant number, since it is smaller than the sum of its proper divisors (42752441000).

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

31503013000 is a wasteful number, since it uses less digits than its factorization.

31503013000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230107 (or 230093 counting only the distinct ones).

The product of its (nonzero) digits is 135, while the sum is 16.

Adding to 31503013000 its reverse (31030513), we get a palindrome (31534043513).

The spelling of 31503013000 in words is "thirty-one billion, five hundred three million, thirteen thousand".