25644979 has 2 divisors, whose sum is σ = 25644980. Its totient is φ = 25644978.

The previous prime is 25644943. The next prime is 25644989. The reversal of 25644979 is 97944652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25644979 - 2⁹ = 25644467 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25644929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12822489 + 12822490.

It is an arithmetic number, because the mean of its divisors is an integer number (12822490).

Almost surely, 2^25644979 is an apocalyptic number.

25644979 is a deficient number, since it is larger than the sum of its proper divisors (1).

25644979 is an equidigital number, since it uses as much as digits as its factorization.

25644979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 46.

The square root of 25644979 is about 5064.0871832937. The cubic root of 25644979 is about 294.8950272876.

The spelling of 25644979 in words is "twenty-five million, six hundred forty-four thousand, nine hundred seventy-nine".