979877809 has 9 divisors (see below), whose sum is σ = 1025086699. Its totient is φ = 936585760.

The previous prime is 979877753. The next prime is 979877827. The reversal of 979877809 is 908778979.

The square root of 979877809 is 31303.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 166487409 + 813390400 = 12903^2 + 28520^2 .

It is not a de Polignac number, because 979877809 - 2¹¹ = 979875761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (979877869) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 719289 + ... + 720649.

Almost surely, 2^979877809 is an apocalyptic number.

979877809 is the 31303-rd square number.

979877809 is the 15652-nd centered octagonal number.

It is an amenable number.

979877809 is a deficient number, since it is larger than the sum of its proper divisors (45208890).

979877809 is an frugal number, since it uses more digits than its factorization.

979877809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768 (or 1384 counting only the distinct ones).

The product of its (nonzero) digits is 16003008, while the sum is 64.

The cubic root of 979877809 is about 993.2471040438.

Multiplying 979877809 by its sum of digits (64), we get a square (62712179776 = 250424²).

The spelling of 979877809 in words is "nine hundred seventy-nine million, eight hundred seventy-seven thousand, eight hundred nine".