31000000031 has 64 divisors (see below), whose sum is σ = 45227212800. Its totient is φ = 20442326400.

The previous prime is 31000000027. The next prime is 31000000067. The reversal of 31000000031 is 13000000013.

It is a cyclic number.

It is not a de Polignac number, because 31000000031 - 2² = 31000000027 is a prime.

It is a super-2 number, since 2×31000000031² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30999999955 and 31000000018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31000000831) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 563300 + ... + 615878.

It is an arithmetic number, because the mean of its divisors is an integer number (706675200).

Almost surely, 2^31000000031 is an apocalyptic number.

31000000031 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31000000031 is a deficient number, since it is larger than the sum of its proper divisors (14227212769).

31000000031 is a wasteful number, since it uses less digits than its factorization.

31000000031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52660.

The product of its (nonzero) digits is 9, while the sum is 8.

Adding to 31000000031 its reverse (13000000013), we get a palindrome (44000000044).

The spelling of 31000000031 in words is "thirty-one billion, thirty-one", and thus it is an aban number and an uban number.