25618979 has 2 divisors, whose sum is σ = 25618980. Its totient is φ = 25618978.

The previous prime is 25618889. The next prime is 25618997. The reversal of 25618979 is 97981652.

Together with next prime (25618997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25618979 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25618279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12809489 + 12809490.

It is an arithmetic number, because the mean of its divisors is an integer number (12809490).

Almost surely, 2^25618979 is an apocalyptic number.

25618979 is a deficient number, since it is larger than the sum of its proper divisors (1).

25618979 is an equidigital number, since it uses as much as digits as its factorization.

25618979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 47.

The square root of 25618979 is about 5061.5194359006. The cubic root of 25618979 is about 294.7953344353.

The spelling of 25618979 in words is "twenty-five million, six hundred eighteen thousand, nine hundred seventy-nine".