279420257 has 2 divisors, whose sum is σ = 279420258. Its totient is φ = 279420256.

The previous prime is 279420227. The next prime is 279420259. The reversal of 279420257 is 752024972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 259564321 + 19855936 = 16111^2 + 4456^2 .

It is a cyclic number.

It is not a de Polignac number, because 279420257 - 2¹² = 279416161 is a prime.

Together with 279420259, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 279420257.

It is not a weakly prime, because it can be changed into another prime (279420259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139710128 + 139710129.

It is an arithmetic number, because the mean of its divisors is an integer number (139710129).

Almost surely, 2^279420257 is an apocalyptic number.

It is an amenable number.

279420257 is a deficient number, since it is larger than the sum of its proper divisors (1).

279420257 is an equidigital number, since it uses as much as digits as its factorization.

279420257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 279420257 is about 16715.8684189605. The cubic root of 279420257 is about 653.7614315313.

The spelling of 279420257 in words is "two hundred seventy-nine million, four hundred twenty thousand, two hundred fifty-seven".