279248261 has 2 divisors, whose sum is σ = 279248262. Its totient is φ = 279248260.

The previous prime is 279248251. The next prime is 279248309. The reversal of 279248261 is 162842972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142802500 + 136445761 = 11950^2 + 11681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-279248261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (279248231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139624130 + 139624131.

It is an arithmetic number, because the mean of its divisors is an integer number (139624131).

Almost surely, 2^279248261 is an apocalyptic number.

It is an amenable number.

279248261 is a deficient number, since it is larger than the sum of its proper divisors (1).

279248261 is an equidigital number, since it uses as much as digits as its factorization.

279248261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 279248261 is about 16710.7229346908. The cubic root of 279248261 is about 653.6272639375.

The spelling of 279248261 in words is "two hundred seventy-nine million, two hundred forty-eight thousand, two hundred sixty-one".