2551979 has 2 divisors, whose sum is σ = 2551980. Its totient is φ = 2551978.

The previous prime is 2551961. The next prime is 2551981. The reversal of 2551979 is 9791552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2551979 - 2⁸ = 2551723 is a prime.

Together with 2551981, 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 (2551999) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275989 + 1275990.

It is an arithmetic number, because the mean of its divisors is an integer number (1275990).

2^2551979 is an apocalyptic number.

2551979 is a deficient number, since it is larger than the sum of its proper divisors (1).

2551979 is an equidigital number, since it uses as much as digits as its factorization.

2551979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28350, while the sum is 38.

The square root of 2551979 is about 1597.4914710257. The cubic root of 2551979 is about 136.6550542053.

The spelling of 2551979 in words is "two million, five hundred fifty-one thousand, nine hundred seventy-nine".