279442816909 has 2 divisors, whose sum is σ = 279442816910. Its totient is φ = 279442816908.

The previous prime is 279442816843. The next prime is 279442816931. The reversal of 279442816909 is 909618244972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221655464809 + 57787352100 = 470803^2 + 240390^2 .

It is a cyclic number.

It is not a de Polignac number, because 279442816909 - 2¹³ = 279442808717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (279442816949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139721408454 + 139721408455.

It is an arithmetic number, because the mean of its divisors is an integer number (139721408455).

Almost surely, 2^279442816909 is an apocalyptic number.

It is an amenable number.

279442816909 is a deficient number, since it is larger than the sum of its proper divisors (1).

279442816909 is an equidigital number, since it uses as much as digits as its factorization.

279442816909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15676416, while the sum is 61.

The spelling of 279442816909 in words is "two hundred seventy-nine billion, four hundred forty-two million, eight hundred sixteen thousand, nine hundred nine".