16056591 has 4 divisors (see below), whose sum is σ = 21408792. Its totient is φ = 10704392.

The previous prime is 16056583. The next prime is 16056613. The reversal of 16056591 is 19565061.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16056591 - 2³ = 16056583 is a prime.

It is a super-2 number, since 2×16056591² = 515628229082562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16056511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2676096 + ... + 2676101.

It is an arithmetic number, because the mean of its divisors is an integer number (5352198).

Almost surely, 2^16056591 is an apocalyptic number.

16056591 is a deficient number, since it is larger than the sum of its proper divisors (5352201).

16056591 is an equidigital number, since it uses as much as digits as its factorization.

16056591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5352200.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 16056591 is about 4007.0676310739. The cubic root of 16056591 is about 252.2809445435.

The spelling of 16056591 in words is "sixteen million, fifty-six thousand, five hundred ninety-one".