15656931097 has 2 divisors, whose sum is σ = 15656931098. Its totient is φ = 15656931096.

The previous prime is 15656931089. The next prime is 15656931107. The reversal of 15656931097 is 79013965651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15472623321 + 184307776 = 124389^2 + 13576^2 .

It is an emirp because it is prime and its reverse (79013965651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15656931097 - 2³ = 15656931089 is a prime.

It is not a weakly prime, because it can be changed into another prime (15656931007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7828465548 + 7828465549.

It is an arithmetic number, because the mean of its divisors is an integer number (7828465549).

Almost surely, 2^15656931097 is an apocalyptic number.

It is an amenable number.

15656931097 is a deficient number, since it is larger than the sum of its proper divisors (1).

15656931097 is an equidigital number, since it uses as much as digits as its factorization.

15656931097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1530900, while the sum is 52.

The spelling of 15656931097 in words is "fifteen billion, six hundred fifty-six million, nine hundred thirty-one thousand, ninety-seven".