31114814581 has 2 divisors, whose sum is σ = 31114814582. Its totient is φ = 31114814580.

The previous prime is 31114814527. The next prime is 31114814609. The reversal of 31114814581 is 18541841113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29047748356 + 2067066225 = 170434^2 + 45465^2 .

It is a cyclic number.

It is not a de Polignac number, because 31114814581 - 2²⁷ = 30980596853 is a prime.

It is a super-2 number, since 2×31114814581² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31114814581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31114814501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15557407290 + 15557407291.

It is an arithmetic number, because the mean of its divisors is an integer number (15557407291).

Almost surely, 2^31114814581 is an apocalyptic number.

It is an amenable number.

31114814581 is a deficient number, since it is larger than the sum of its proper divisors (1).

31114814581 is an equidigital number, since it uses as much as digits as its factorization.

31114814581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 37.

The spelling of 31114814581 in words is "thirty-one billion, one hundred fourteen million, eight hundred fourteen thousand, five hundred eighty-one".