279799739521 has 9 divisors (see below), whose sum is σ = 280877124321. Its totient is φ = 278726477652.

The previous prime is 279799739507. The next prime is 279799739573. The reversal of 279799739521 is 125937997972.

The square root of 279799739521 is 528961.

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

It is not a de Polignac number, because 279799739521 - 2²³ = 279791350913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (279709739521) 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, 162390166 + ... + 162391888.

It is an arithmetic number, because the mean of its divisors is an integer number (31208569369).

Almost surely, 2^279799739521 is an apocalyptic number.

279799739521 is the 528961-st square number.

279799739521 is the 264481-st centered octagonal number.

It is an amenable number.

279799739521 is a deficient number, since it is larger than the sum of its proper divisors (1077384800).

279799739521 is an frugal number, since it uses more digits than its factorization.

279799739521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4060 (or 2030 counting only the distinct ones).

The product of its digits is 135025380, while the sum is 70.

The spelling of 279799739521 in words is "two hundred seventy-nine billion, seven hundred ninety-nine million, seven hundred thirty-nine thousand, five hundred twenty-one".