31000031012 has 48 divisors (see below), whose sum is σ = 59545559808. Its totient is φ = 14061196800.

The previous prime is 31000031011. The next prime is 31000031059. The reversal of 31000031012 is 21013000013.

It is a super-2 number, since 2×31000031012² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31000030984 and 31000031002.

It is not an unprimeable number, because it can be changed into a prime (31000031011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211637 + ... + 326787.

It is an arithmetic number, because the mean of its divisors is an integer number (1240532496).

Almost surely, 2^31000031012 is an apocalyptic number.

It is an amenable number.

31000031012 is a deficient number, since it is larger than the sum of its proper divisors (28545528796).

31000031012 is a wasteful number, since it uses less digits than its factorization.

31000031012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115316 (or 115314 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 31000031012 its reverse (21013000013), we get a palindrome (52013031025).

The spelling of 31000031012 in words is "thirty-one billion, thirty-one thousand, twelve".