279670687921 has 9 divisors (see below), whose sum is σ = 292371676779. Its totient is φ = 267499458336.

The previous prime is 279670687897. The next prime is 279670687951. The reversal of 279670687921 is 129786076972.

The square root of 279670687921 is 528839.

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., 229196775025 + 50473912896 = 478745^2 + 224664^2 .

It is not a de Polignac number, because 279670687921 - 2⁵ = 279670687889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (279670687951) 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, 12151801 + ... + 12174793.

Almost surely, 2^279670687921 is an apocalyptic number.

279670687921 is the 528839-th square number.

279670687921 is the 264420-th centered octagonal number.

It is an amenable number.

279670687921 is a deficient number, since it is larger than the sum of its proper divisors (12700988858).

279670687921 is an frugal number, since it uses more digits than its factorization.

279670687921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46032 (or 23016 counting only the distinct ones).

The product of its (nonzero) digits is 32006016, while the sum is 64.

Multiplying 279670687921 by its sum of digits (64), we get a square (17898924026944 = 4230712²).

The spelling of 279670687921 in words is "two hundred seventy-nine billion, six hundred seventy million, six hundred eighty-seven thousand, nine hundred twenty-one".