31319689097 has 2 divisors, whose sum is σ = 31319689098. Its totient is φ = 31319689096.

The previous prime is 31319689087. The next prime is 31319689111. The reversal of 31319689097 is 79098691313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28704491776 + 2615197321 = 169424^2 + 51139^2 .

It is a cyclic number.

It is not a de Polignac number, because 31319689097 - 2²⁸ = 31051253641 is a prime.

It is not a weakly prime, because it can be changed into another prime (31319689087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15659844548 + 15659844549.

It is an arithmetic number, because the mean of its divisors is an integer number (15659844549).

Almost surely, 2^31319689097 is an apocalyptic number.

It is an amenable number.

31319689097 is a deficient number, since it is larger than the sum of its proper divisors (1).

31319689097 is an equidigital number, since it uses as much as digits as its factorization.

31319689097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2204496, while the sum is 56.

The spelling of 31319689097 in words is "thirty-one billion, three hundred nineteen million, six hundred eighty-nine thousand, ninety-seven".