31789215097 has 2 divisors, whose sum is σ = 31789215098. Its totient is φ = 31789215096.

The previous prime is 31789215091. The next prime is 31789215109. The reversal of 31789215097 is 79051298713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26182799721 + 5606415376 = 161811^2 + 74876^2 .

It is a cyclic number.

It is not a de Polignac number, because 31789215097 - 2²³ = 31780826489 is a prime.

It is not a weakly prime, because it can be changed into another prime (31789215091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15894607548 + 15894607549.

It is an arithmetic number, because the mean of its divisors is an integer number (15894607549).

Almost surely, 2^31789215097 is an apocalyptic number.

It is an amenable number.

31789215097 is a deficient number, since it is larger than the sum of its proper divisors (1).

31789215097 is an equidigital number, since it uses as much as digits as its factorization.

31789215097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 952560, while the sum is 52.

The spelling of 31789215097 in words is "thirty-one billion, seven hundred eighty-nine million, two hundred fifteen thousand, ninety-seven".