279048989 has 2 divisors, whose sum is σ = 279048990. Its totient is φ = 279048988.

The previous prime is 279048947. The next prime is 279049013. The reversal of 279048989 is 989840972.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 265136089 + 13912900 = 16283^2 + 3730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-279048989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (279048089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139524494 + 139524495.

It is an arithmetic number, because the mean of its divisors is an integer number (139524495).

Almost surely, 2^279048989 is an apocalyptic number.

It is an amenable number.

279048989 is a deficient number, since it is larger than the sum of its proper divisors (1).

279048989 is an equidigital number, since it uses as much as digits as its factorization.

279048989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 56.

The square root of 279048989 is about 16704.7594714800. The cubic root of 279048989 is about 653.4717504575.

The spelling of 279048989 in words is "two hundred seventy-nine million, forty-eight thousand, nine hundred eighty-nine".