31900000002 has 16 divisors (see below), whose sum is σ = 68707692480. Its totient is φ = 9815384592.

The previous prime is 31899999961. The next prime is 31900000007. The reversal of 31900000002 is 20000000913.

It is a super-2 number, since 2×31900000002² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31900000007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 204487102 + ... + 204487257.

It is an arithmetic number, because the mean of its divisors is an integer number (4294230780).

Almost surely, 2^31900000002 is an apocalyptic number.

31900000002 is an abundant number, since it is smaller than the sum of its proper divisors (36807692478).

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

31900000002 is a wasteful number, since it uses less digits than its factorization.

31900000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408974377.

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 31900000002 its reverse (20000000913), we get a palindrome (51900000915).

The spelling of 31900000002 in words is "thirty-one billion, nine hundred million, two", and thus it is an aban number.