25959979 has 2 divisors, whose sum is σ = 25959980. Its totient is φ = 25959978.

The previous prime is 25959961. The next prime is 25960007. The reversal of 25959979 is 97995952.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25959979 - 2¹³ = 25951787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25959919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12979989 + 12979990.

It is an arithmetic number, because the mean of its divisors is an integer number (12979990).

Almost surely, 2^25959979 is an apocalyptic number.

25959979 is a deficient number, since it is larger than the sum of its proper divisors (1).

25959979 is an equidigital number, since it uses as much as digits as its factorization.

25959979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2296350, while the sum is 55.

The square root of 25959979 is about 5095.0936203371. The cubic root of 25959979 is about 296.0975261482.

The spelling of 25959979 in words is "twenty-five million, nine hundred fifty-nine thousand, nine hundred seventy-nine".