16565139 has 12 divisors (see below), whose sum is σ = 24051456. Its totient is φ = 10986192.

The previous prime is 16565137. The next prime is 16565161. The reversal of 16565139 is 93156561.

It is not a de Polignac number, because 16565139 - 2¹ = 16565137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16565137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2899 + ... + 6444.

It is an arithmetic number, because the mean of its divisors is an integer number (2004288).

Almost surely, 2^16565139 is an apocalyptic number.

16565139 is a deficient number, since it is larger than the sum of its proper divisors (7486317).

16565139 is a wasteful number, since it uses less digits than its factorization.

16565139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9546 (or 9543 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 16565139 is about 4070.0293610735. The cubic root of 16565139 is about 254.9167432928.

The spelling of 16565139 in words is "sixteen million, five hundred sixty-five thousand, one hundred thirty-nine".