2578381979 has 2 divisors, whose sum is σ = 2578381980. Its totient is φ = 2578381978.

The previous prime is 2578381957. The next prime is 2578382011. The reversal of 2578381979 is 9791838752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2578381979 - 2¹² = 2578377883 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2578381579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1289190989 + 1289190990.

It is an arithmetic number, because the mean of its divisors is an integer number (1289190990).

Almost surely, 2^2578381979 is an apocalyptic number.

2578381979 is a deficient number, since it is larger than the sum of its proper divisors (1).

2578381979 is an equidigital number, since it uses as much as digits as its factorization.

2578381979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 59.

The square root of 2578381979 is about 50777.7705201794. The cubic root of 2578381979 is about 1371.2471955473.

The spelling of 2578381979 in words is "two billion, five hundred seventy-eight million, three hundred eighty-one thousand, nine hundred seventy-nine".