16591089 has 4 divisors (see below), whose sum is σ = 22121456. Its totient is φ = 11060724.

The previous prime is 16591063. The next prime is 16591093. The reversal of 16591089 is 98019561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-16591089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16591039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2765179 + ... + 2765184.

It is an arithmetic number, because the mean of its divisors is an integer number (5530364).

Almost surely, 2^16591089 is an apocalyptic number.

It is an amenable number.

16591089 is a deficient number, since it is larger than the sum of its proper divisors (5530367).

16591089 is an equidigital number, since it uses as much as digits as its factorization.

16591089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5530366.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 16591089 is about 4073.2160512303. The cubic root of 16591089 is about 255.0497865112.

The spelling of 16591089 in words is "sixteen million, five hundred ninety-one thousand, eighty-nine".