31800000318 has 32 divisors (see below), whose sum is σ = 68611777056. Its totient is φ = 9788233728.

The previous prime is 31800000317. The next prime is 31800000347. The reversal of 31800000318 is 81300000813.

It is a super-2 number, since 2×31800000318² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31800000317) 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, 2935771 + ... + 2946582.

It is an arithmetic number, because the mean of its divisors is an integer number (2144118033).

Almost surely, 2^31800000318 is an apocalyptic number.

31800000318 is an abundant number, since it is smaller than the sum of its proper divisors (36811776738).

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

31800000318 is a wasteful number, since it uses less digits than its factorization.

31800000318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5882428.

The product of its (nonzero) digits is 576, while the sum is 24.

The spelling of 31800000318 in words is "thirty-one billion, eight hundred million, three hundred eighteen", and thus it is an aban number.