31132731242791 has 2 divisors, whose sum is σ = 31132731242792. Its totient is φ = 31132731242790.

The previous prime is 31132731242773. The next prime is 31132731242813. The reversal of 31132731242791 is 19724213723113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31132731242791 - 2²⁷ = 31132597025063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31132731243791) 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, 15566365621395 + 15566365621396.

It is an arithmetic number, because the mean of its divisors is an integer number (15566365621396).

Almost surely, 2^{31132731242791} is an apocalyptic number.

31132731242791 is a deficient number, since it is larger than the sum of its proper divisors (1).

31132731242791 is an equidigital number, since it uses as much as digits as its factorization.

31132731242791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 46.

The spelling of 31132731242791 in words is "thirty-one trillion, one hundred thirty-two billion, seven hundred thirty-one million, two hundred forty-two thousand, seven hundred ninety-one".