31481646416639 has 2 divisors, whose sum is σ = 31481646416640. Its totient is φ = 31481646416638.

The previous prime is 31481646416629. The next prime is 31481646416641. The reversal of 31481646416639 is 93661464618413.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31481646416639 - 2²⁴ = 31481629639423 is a prime.

It is a super-2 number, since 2×31481646416639² (a number of 28 digits) contains 22 as substring.

Together with 31481646416641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31481646416629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15740823208319 + 15740823208320.

It is an arithmetic number, because the mean of its divisors is an integer number (15740823208320).

Almost surely, 2^{31481646416639} is an apocalyptic number.

31481646416639 is a deficient number, since it is larger than the sum of its proper divisors (1).

31481646416639 is an equidigital number, since it uses as much as digits as its factorization.

31481646416639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53747712, while the sum is 62.

The spelling of 31481646416639 in words is "thirty-one trillion, four hundred eighty-one billion, six hundred forty-six million, four hundred sixteen thousand, six hundred thirty-nine".