279431 has 2 divisors, whose sum is σ = 279432. Its totient is φ = 279430.

The previous prime is 279421. The next prime is 279443. The reversal of 279431 is 134972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 279431 - 2¹⁴ = 263047 is a prime.

It is a super-2 number, since 2×279431² = 156163367522, which contains 22 as substring.

It is a Sophie Germain prime.

It is equal to p₂₄₃₈₉ and since 279431 and 24389 have the same sum of digits, it is a Honaker prime.

It is a zygodrome in base 6.

It is a self number, because there is not a number n which added to its sum of digits gives 279431.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 279431.

It is not a weakly prime, because it can be changed into another prime (279421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139715 + 139716.

It is an arithmetic number, because the mean of its divisors is an integer number (139716).

2²⁷⁹⁴³¹ is an apocalyptic number.

279431 is a deficient number, since it is larger than the sum of its proper divisors (1).

279431 is an equidigital number, since it uses as much as digits as its factorization.

279431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 26.

The square root of 279431 is about 528.6123343245. The cubic root of 279431 is about 65.3769809913.

The spelling of 279431 in words is "two hundred seventy-nine thousand, four hundred thirty-one".