31113010081 has 2 divisors, whose sum is σ = 31113010082. Its totient is φ = 31113010080.

The previous prime is 31113010067. The next prime is 31113010111. The reversal of 31113010081 is 18001031113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20074355856 + 11038654225 = 141684^2 + 105065^2 .

It is a cyclic number.

It is not a de Polignac number, because 31113010081 - 2²⁷ = 30978792353 is a prime.

It is a super-2 number, since 2×31113010081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31113010001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556505040 + 15556505041.

It is an arithmetic number, because the mean of its divisors is an integer number (15556505041).

Almost surely, 2^31113010081 is an apocalyptic number.

It is an amenable number.

31113010081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31113010081 is an equidigital number, since it uses as much as digits as its factorization.

31113010081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 31113010081 its reverse (18001031113), we get a palindrome (49114041194).

The spelling of 31113010081 in words is "thirty-one billion, one hundred thirteen million, ten thousand, eighty-one".