16045591 has 4 divisors (see below), whose sum is σ = 16348392. Its totient is φ = 15742792.

The previous prime is 16045583. The next prime is 16045597. The reversal of 16045591 is 19554061.

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 16045591 - 2³ = 16045583 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16045597) 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, 151321 + ... + 151426.

It is an arithmetic number, because the mean of its divisors is an integer number (4087098).

Almost surely, 2^16045591 is an apocalyptic number.

16045591 is a deficient number, since it is larger than the sum of its proper divisors (302801).

16045591 is an equidigital number, since it uses as much as digits as its factorization.

16045591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302800.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 16045591 is about 4005.6948211265. The cubic root of 16045591 is about 252.2233207646.

The spelling of 16045591 in words is "sixteen million, forty-five thousand, five hundred ninety-one".