31151522515081 has 2 divisors, whose sum is σ = 31151522515082. Its totient is φ = 31151522515080.

The previous prime is 31151522515063. The next prime is 31151522515123. The reversal of 31151522515081 is 18051522515113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22419846201600 + 8731676313481 = 4734960^2 + 2954941^2 .

It is a cyclic number.

It is not a de Polignac number, because 31151522515081 - 2⁵ = 31151522515049 is a prime.

It is a super-2 number, since 2×31151522515081² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31151522515681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15575761257540 + 15575761257541.

It is an arithmetic number, because the mean of its divisors is an integer number (15575761257541).

Almost surely, 2^{31151522515081} is an apocalyptic number.

It is an amenable number.

31151522515081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31151522515081 is an equidigital number, since it uses as much as digits as its factorization.

31151522515081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60000, while the sum is 40.

The spelling of 31151522515081 in words is "thirty-one trillion, one hundred fifty-one billion, five hundred twenty-two million, five hundred fifteen thousand, eighty-one".