15915491 has 2 divisors, whose sum is σ = 15915492. Its totient is φ = 15915490.

The previous prime is 15915463. The next prime is 15915539. The reversal of 15915491 is 19451951.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15915491 - 2¹⁰ = 15914467 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (15915401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7957745 + 7957746.

It is an arithmetic number, because the mean of its divisors is an integer number (7957746).

Almost surely, 2^15915491 is an apocalyptic number.

15915491 is a deficient number, since it is larger than the sum of its proper divisors (1).

15915491 is an equidigital number, since it uses as much as digits as its factorization.

15915491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 35.

The square root of 15915491 is about 3989.4223892689. The cubic root of 15915491 is about 251.5397821466.

The spelling of 15915491 in words is "fifteen million, nine hundred fifteen thousand, four hundred ninety-one".