1278590879 has 2 divisors, whose sum is σ = 1278590880. Its totient is φ = 1278590878.

The previous prime is 1278590849. The next prime is 1278590891. The reversal of 1278590879 is 9780958721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1278590879 - 2²⁰ = 1277542303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278590849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639295439 + 639295440.

It is an arithmetic number, because the mean of its divisors is an integer number (639295440).

Almost surely, 2^1278590879 is an apocalyptic number.

1278590879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278590879 is an equidigital number, since it uses as much as digits as its factorization.

1278590879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2540160, while the sum is 56.

The square root of 1278590879 is about 35757.3891524535. The cubic root of 1278590879 is about 1085.3684687920.

The spelling of 1278590879 in words is "one billion, two hundred seventy-eight million, five hundred ninety thousand, eight hundred seventy-nine".