31912447195897 has 2 divisors, whose sum is σ = 31912447195898. Its totient is φ = 31912447195896.

The previous prime is 31912447195813. The next prime is 31912447196009. The reversal of 31912447195897 is 79859174421913.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29377906779321 + 2534540416576 = 5420139^2 + 1592024^2 .

It is a cyclic number.

It is not a de Polignac number, because 31912447195897 - 2²³ = 31912438807289 is a prime.

It is not a weakly prime, because it can be changed into another prime (31912447195397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15956223597948 + 15956223597949.

It is an arithmetic number, because the mean of its divisors is an integer number (15956223597949).

Almost surely, 2^{31912447195897} is an apocalyptic number.

It is an amenable number.

31912447195897 is a deficient number, since it is larger than the sum of its proper divisors (1).

31912447195897 is an equidigital number, since it uses as much as digits as its factorization.

31912447195897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 137168640, while the sum is 70.

The spelling of 31912447195897 in words is "thirty-one trillion, nine hundred twelve billion, four hundred forty-seven million, one hundred ninety-five thousand, eight hundred ninety-seven".