16979731 has 4 divisors (see below), whose sum is σ = 17013600. Its totient is φ = 16945864.

The previous prime is 16979713. The next prime is 16979759. The reversal of 16979731 is 13797961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13797961 = 173 ⋅79757.

It is a cyclic number.

It is not a de Polignac number, because 16979731 - 2⁷ = 16979603 is a prime.

It is a super-2 number, since 2×16979731² = 576622529664722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16979231) 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, 16171 + ... + 17188.

It is an arithmetic number, because the mean of its divisors is an integer number (4253400).

Almost surely, 2^16979731 is an apocalyptic number.

16979731 is a deficient number, since it is larger than the sum of its proper divisors (33869).

16979731 is an equidigital number, since it uses as much as digits as its factorization.

16979731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33868.

The product of its digits is 71442, while the sum is 43.

The square root of 16979731 is about 4120.6469152307. The cubic root of 16979731 is about 257.0259276279.

The spelling of 16979731 in words is "sixteen million, nine hundred seventy-nine thousand, seven hundred thirty-one".