25149979 has 2 divisors, whose sum is σ = 25149980. Its totient is φ = 25149978.

The previous prime is 25149967. The next prime is 25149983. The reversal of 25149979 is 97994152.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25149979 - 2¹⁷ = 25018907 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25249979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12574989 + 12574990.

It is an arithmetic number, because the mean of its divisors is an integer number (12574990).

Almost surely, 2^25149979 is an apocalyptic number.

25149979 is a deficient number, since it is larger than the sum of its proper divisors (1).

25149979 is an equidigital number, since it uses as much as digits as its factorization.

25149979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 46.

The square root of 25149979 is about 5014.9754735193. The cubic root of 25149979 is about 292.9853300983.

The spelling of 25149979 in words is "twenty-five million, one hundred forty-nine thousand, nine hundred seventy-nine".