15913691 has 2 divisors, whose sum is σ = 15913692. Its totient is φ = 15913690.

The previous prime is 15913679. The next prime is 15913747. The reversal of 15913691 is 19631951.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15913691 - 2¹⁸ = 15651547 is a prime.

It is a super-2 number, since 2×15913691² = 506491122486962, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15913291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7956845 + 7956846.

It is an arithmetic number, because the mean of its divisors is an integer number (7956846).

Almost surely, 2^15913691 is an apocalyptic number.

15913691 is a deficient number, since it is larger than the sum of its proper divisors (1).

15913691 is an equidigital number, since it uses as much as digits as its factorization.

15913691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7290, while the sum is 35.

The square root of 15913691 is about 3989.1967863218. The cubic root of 15913691 is about 251.5302989608.

The spelling of 15913691 in words is "fifteen million, nine hundred thirteen thousand, six hundred ninety-one".