15916491 has 6 divisors (see below), whose sum is σ = 22990500. Its totient is φ = 10610988.

The previous prime is 15916469. The next prime is 15916499. The reversal of 15916491 is 19461951.

15916491 is a `hidden beast` number, since 1 + 5 + 9 + 1 + 649 + 1 = 666.

It is not a de Polignac number, because 15916491 - 2⁶ = 15916427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15916499) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 884241 + ... + 884258.

It is an arithmetic number, because the mean of its divisors is an integer number (3831750).

Almost surely, 2^15916491 is an apocalyptic number.

15916491 is a deficient number, since it is larger than the sum of its proper divisors (7074009).

15916491 is a wasteful number, since it uses less digits than its factorization.

15916491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768505 (or 1768502 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 15916491 is about 3989.5477187270. The cubic root of 15916491 is about 251.5450502743.

The spelling of 15916491 in words is "fifteen million, nine hundred sixteen thousand, four hundred ninety-one".