31140665513 has 2 divisors, whose sum is σ = 31140665514. Its totient is φ = 31140665512.

The previous prime is 31140665509. The next prime is 31140665519. The reversal of 31140665513 is 31556604113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24063145129 + 7077520384 = 155123^2 + 84128^2 .

It is a cyclic number.

It is not a de Polignac number, because 31140665513 - 2² = 31140665509 is a prime.

It is a super-3 number, since 3×31140665513³ (a number of 32 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31140665519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15570332756 + 15570332757.

It is an arithmetic number, because the mean of its divisors is an integer number (15570332757).

Almost surely, 2^31140665513 is an apocalyptic number.

It is an amenable number.

31140665513 is a deficient number, since it is larger than the sum of its proper divisors (1).

31140665513 is an equidigital number, since it uses as much as digits as its factorization.

31140665513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 31140665513 in words is "thirty-one billion, one hundred forty million, six hundred sixty-five thousand, five hundred thirteen".