15319696991 has 2 divisors, whose sum is σ = 15319696992. Its totient is φ = 15319696990.

The previous prime is 15319696961. The next prime is 15319696993. The reversal of 15319696991 is 19969691351.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15319696991 - 2⁶ = 15319696927 is a prime.

Together with 15319696993, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15319696991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15319696993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7659848495 + 7659848496.

It is an arithmetic number, because the mean of its divisors is an integer number (7659848496).

Almost surely, 2^15319696991 is an apocalyptic number.

15319696991 is a deficient number, since it is larger than the sum of its proper divisors (1).

15319696991 is an equidigital number, since it uses as much as digits as its factorization.

15319696991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3542940, while the sum is 59.

The spelling of 15319696991 in words is "fifteen billion, three hundred nineteen million, six hundred ninety-six thousand, nine hundred ninety-one".