31309121706863 has 48 divisors (see below), whose sum is σ = 42846953071104. Its totient is φ = 22489067240640.

The previous prime is 31309121706851. The next prime is 31309121706937. The reversal of 31309121706863 is 36860712190313.

It is not a de Polignac number, because 31309121706863 - 2⁶ = 31309121706799 is a prime.

It is a super-2 number, since 2×31309121706863² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31309121706803) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2021006 + ... + 8167172.

It is an arithmetic number, because the mean of its divisors is an integer number (892644855648).

Almost surely, 2^{31309121706863} is an apocalyptic number.

31309121706863 is a deficient number, since it is larger than the sum of its proper divisors (11537831364241).

31309121706863 is a wasteful number, since it uses less digits than its factorization.

31309121706863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6146932 (or 6146925 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 50.

The spelling of 31309121706863 in words is "thirty-one trillion, three hundred nine billion, one hundred twenty-one million, seven hundred six thousand, eight hundred sixty-three".