25242979 has 2 divisors, whose sum is σ = 25242980. Its totient is φ = 25242978.

The previous prime is 25242961. The next prime is 25243007. The reversal of 25242979 is 97924252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25242979 - 2¹⁹ = 24718691 is a prime.

It is not a weakly prime, because it can be changed into another prime (25242379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12621489 + 12621490.

It is an arithmetic number, because the mean of its divisors is an integer number (12621490).

Almost surely, 2^25242979 is an apocalyptic number.

25242979 is a deficient number, since it is larger than the sum of its proper divisors (1).

25242979 is an equidigital number, since it uses as much as digits as its factorization.

25242979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 25242979 is about 5024.2391463783. The cubic root of 25242979 is about 293.3460211741.

The spelling of 25242979 in words is "twenty-five million, two hundred forty-two thousand, nine hundred seventy-nine".