25299979 has 2 divisors, whose sum is σ = 25299980. Its totient is φ = 25299978.

The previous prime is 25299949. The next prime is 25299983. The reversal of 25299979 is 97999252.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25299979 - 2¹⁵ = 25267211 is a prime.

It is not a weakly prime, because it can be changed into another prime (25299929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12649989 + 12649990.

It is an arithmetic number, because the mean of its divisors is an integer number (12649990).

Almost surely, 2^25299979 is an apocalyptic number.

25299979 is a deficient number, since it is larger than the sum of its proper divisors (1).

25299979 is an equidigital number, since it uses as much as digits as its factorization.

25299979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 918540, while the sum is 52.

The square root of 25299979 is about 5029.9084484710. The cubic root of 25299979 is about 293.5666522064.

The spelling of 25299979 in words is "twenty-five million, two hundred ninety-nine thousand, nine hundred seventy-nine".