15317791 has 2 divisors, whose sum is σ = 15317792. Its totient is φ = 15317790.

The previous prime is 15317789. The next prime is 15317801. The reversal of 15317791 is 19771351.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15317791 - 2¹ = 15317789 is a prime.

It is a super-2 number, since 2×15317791² = 469269442239362, which contains 22 as substring.

Together with 15317789, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15318791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7658895 + 7658896.

It is an arithmetic number, because the mean of its divisors is an integer number (7658896).

Almost surely, 2^15317791 is an apocalyptic number.

15317791 is a deficient number, since it is larger than the sum of its proper divisors (1).

15317791 is an equidigital number, since it uses as much as digits as its factorization.

15317791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6615, while the sum is 34.

The square root of 15317791 is about 3913.7949614153. The cubic root of 15317791 is about 248.3506951011.

The spelling of 15317791 in words is "fifteen million, three hundred seventeen thousand, seven hundred ninety-one".