16639131 has 4 divisors (see below), whose sum is σ = 22185512. Its totient is φ = 11092752.

The previous prime is 16639123. The next prime is 16639163. The reversal of 16639131 is 13193661.

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

It is not a de Polignac number, because 16639131 - 2³ = 16639123 is a prime.

It is a super-2 number, since 2×16639131² = 553721360870322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16639111) 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, 2773186 + ... + 2773191.

It is an arithmetic number, because the mean of its divisors is an integer number (5546378).

Almost surely, 2^16639131 is an apocalyptic number.

16639131 is a deficient number, since it is larger than the sum of its proper divisors (5546381).

16639131 is an equidigital number, since it uses as much as digits as its factorization.

16639131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5546380.

The product of its digits is 2916, while the sum is 30.

The square root of 16639131 is about 4079.1090939076. The cubic root of 16639131 is about 255.2957276493.

The spelling of 16639131 in words is "sixteen million, six hundred thirty-nine thousand, one hundred thirty-one".