16497979 has 4 divisors (see below), whose sum is σ = 16563960. Its totient is φ = 16432000.

The previous prime is 16497977. The next prime is 16497989. The reversal of 16497979 is 97979461.

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 16497979 - 2¹ = 16497977 is a prime.

It is a super-2 number, since 2×16497979² = 544366622168882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16497977) 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, 32614 + ... + 33115.

It is an arithmetic number, because the mean of its divisors is an integer number (4140990).

Almost surely, 2^16497979 is an apocalyptic number.

16497979 is a deficient number, since it is larger than the sum of its proper divisors (65981).

16497979 is an equidigital number, since it uses as much as digits as its factorization.

16497979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65980.

The product of its digits is 857304, while the sum is 52.

The square root of 16497979 is about 4061.7704267967. The cubic root of 16497979 is about 254.5717739058.

The spelling of 16497979 in words is "sixteen million, four hundred ninety-seven thousand, nine hundred seventy-nine".