279948761 has 2 divisors, whose sum is σ = 279948762. Its totient is φ = 279948760.

The previous prime is 279948737. The next prime is 279948763. The reversal of 279948761 is 167849972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223323136 + 56625625 = 14944^2 + 7525^2 .

It is a cyclic number.

It is not a de Polignac number, because 279948761 - 2¹⁰ = 279947737 is a prime.

Together with 279948763, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (279948763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139974380 + 139974381.

It is an arithmetic number, because the mean of its divisors is an integer number (139974381).

Almost surely, 2^279948761 is an apocalyptic number.

It is an amenable number.

279948761 is a deficient number, since it is larger than the sum of its proper divisors (1).

279948761 is an equidigital number, since it uses as much as digits as its factorization.

279948761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 53.

The square root of 279948761 is about 16731.6694026627. The cubic root of 279948761 is about 654.1733533731.

The spelling of 279948761 in words is "two hundred seventy-nine million, nine hundred forty-eight thousand, seven hundred sixty-one".