31318058881 has 2 divisors, whose sum is σ = 31318058882. Its totient is φ = 31318058880.

The previous prime is 31318058879. The next prime is 31318058899. The reversal of 31318058881 is 18885081313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18322058881 + 12996000000 = 135359^2 + 114000^2 .

It is a cyclic number.

It is not a de Polignac number, because 31318058881 - 2¹ = 31318058879 is a prime.

It is a super-2 number, since 2×31318058881² (a number of 22 digits) contains 22 as substring.

Together with 31318058879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31318059881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15659029440 + 15659029441.

It is an arithmetic number, because the mean of its divisors is an integer number (15659029441).

Almost surely, 2^31318058881 is an apocalyptic number.

It is an amenable number.

31318058881 is a deficient number, since it is larger than the sum of its proper divisors (1).

31318058881 is an equidigital number, since it uses as much as digits as its factorization.

31318058881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 184320, while the sum is 46.

The spelling of 31318058881 in words is "thirty-one billion, three hundred eighteen million, fifty-eight thousand, eight hundred eighty-one".