31513213000 has 32 divisors (see below), whose sum is σ = 73740920760. Its totient is φ = 12605284800.

The previous prime is 31513212961. The next prime is 31513213033. The reversal of 31513213000 is 31231513.

It can be written as a sum of positive squares in 4 ways, for example, as 2367211716 + 29146001284 = 48654^2 + 170722^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15755607 + ... + 15757606.

Almost surely, 2^31513213000 is an apocalyptic number.

It is an amenable number.

31513213000 is an abundant number, since it is smaller than the sum of its proper divisors (42227707760).

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

31513213000 is a wasteful number, since it uses less digits than its factorization.

31513213000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31513234 (or 31513220 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 19.

Adding to 31513213000 its reverse (31231513), we get a palindrome (31544444513).

The spelling of 31513213000 in words is "thirty-one billion, five hundred thirteen million, two hundred thirteen thousand".