31311311129897 has 2 divisors, whose sum is σ = 31311311129898. Its totient is φ = 31311311129896.

The previous prime is 31311311129887. The next prime is 31311311130041. The reversal of 31311311129897 is 79892111311313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25760334815296 + 5550976314601 = 5075464^2 + 2356051^2 .

It is a cyclic number.

It is not a de Polignac number, because 31311311129897 - 2¹⁶ = 31311311064361 is a prime.

It is not a weakly prime, because it can be changed into another prime (31311311129807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655655564948 + 15655655564949.

It is an arithmetic number, because the mean of its divisors is an integer number (15655655564949).

Almost surely, 2^{31311311129897} is an apocalyptic number.

It is an amenable number.

31311311129897 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311311129897 is an equidigital number, since it uses as much as digits as its factorization.

31311311129897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 50.

The spelling of 31311311129897 in words is "thirty-one trillion, three hundred eleven billion, three hundred eleven million, one hundred twenty-nine thousand, eight hundred ninety-seven".