31000200020031 has 128 divisors (see below), whose sum is σ = 46469861222400. Its totient is φ = 18225340416000.

The previous prime is 31000200019991. The next prime is 31000200020047. The reversal of 31000200020031 is 13002000200013.

It is a happy number.

It is not a de Polignac number, because 31000200020031 - 2⁹ = 31000200019519 is a prime.

It is a super-2 number, since 2×31000200020031² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31000200019989 and 31000200020016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31000200020081) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 29552144395 + ... + 29552145443.

It is an arithmetic number, because the mean of its divisors is an integer number (363045790800).

Almost surely, 2^{31000200020031} is an apocalyptic number.

31000200020031 is a deficient number, since it is larger than the sum of its proper divisors (15469661202369).

31000200020031 is a wasteful number, since it uses less digits than its factorization.

31000200020031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017.

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 31000200020031 its reverse (13002000200013), we get a palindrome (44002200220044).

The spelling of 31000200020031 in words is "thirty-one trillion, two hundred million, twenty thousand, thirty-one".