15800491 has 6 divisors (see below), whose sum is σ = 18380220. Its totient is φ = 13543236.

The previous prime is 15800467. The next prime is 15800513. The reversal of 15800491 is 19400851.

It is a happy number.

15800491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15800491 - 2⁷ = 15800363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15800431) 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, 161181 + ... + 161278.

It is an arithmetic number, because the mean of its divisors is an integer number (3063370).

Almost surely, 2^15800491 is an apocalyptic number.

15800491 is a deficient number, since it is larger than the sum of its proper divisors (2579729).

15800491 is an equidigital number, since it uses as much as digits as its factorization.

15800491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322473 (or 322466 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 15800491 is about 3974.9831446184. The cubic root of 15800491 is about 250.9324696770.

The spelling of 15800491 in words is "fifteen million, eight hundred thousand, four hundred ninety-one".