16520149 has 4 divisors (see below), whose sum is σ = 16671820. Its totient is φ = 16368480.

The previous prime is 16520143. The next prime is 16520159. The reversal of 16520149 is 94102561.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12744900 + 3775249 = 3570^2 + 1943^2 .

It is a cyclic number.

It is not a de Polignac number, because 16520149 - 2⁹ = 16519637 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 (16520143) 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, 75672 + ... + 75889.

It is an arithmetic number, because the mean of its divisors is an integer number (4167955).

Almost surely, 2^16520149 is an apocalyptic number.

It is an amenable number.

16520149 is a deficient number, since it is larger than the sum of its proper divisors (151671).

16520149 is a wasteful number, since it uses less digits than its factorization.

16520149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151670.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 16520149 is about 4064.4986160657. The cubic root of 16520149 is about 254.6857541301.

The spelling of 16520149 in words is "sixteen million, five hundred twenty thousand, one hundred forty-nine".