16591399 has 6 divisors (see below), whose sum is σ = 18236960. Its totient is φ = 15082980.

The previous prime is 16591397. The next prime is 16591403. The reversal of 16591399 is 99319561.

It is not a de Polignac number, because 16591399 - 2¹ = 16591397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16591391) 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, 68439 + ... + 68680.

Almost surely, 2^16591399 is an apocalyptic number.

16591399 is a deficient number, since it is larger than the sum of its proper divisors (1645561).

16591399 is a wasteful number, since it uses less digits than its factorization.

16591399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137141 (or 137130 counting only the distinct ones).

The product of its digits is 65610, while the sum is 43.

The square root of 16591399 is about 4073.2541045213. The cubic root of 16591399 is about 255.0513750134.

The spelling of 16591399 in words is "sixteen million, five hundred ninety-one thousand, three hundred ninety-nine".