25505979 has 4 divisors (see below), whose sum is σ = 34007976. Its totient is φ = 17003984.

The previous prime is 25505971. The next prime is 25505989. The reversal of 25505979 is 97950552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25505979 - 2³ = 25505971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25505979.

It is not an unprimeable number, because it can be changed into a prime (25505971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4250994 + ... + 4250999.

It is an arithmetic number, because the mean of its divisors is an integer number (8501994).

Almost surely, 2^25505979 is an apocalyptic number.

25505979 is a deficient number, since it is larger than the sum of its proper divisors (8501997).

25505979 is an equidigital number, since it uses as much as digits as its factorization.

25505979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8501996.

The product of its (nonzero) digits is 141750, while the sum is 42.

The square root of 25505979 is about 5050.3444436989. The cubic root of 25505979 is about 294.3612686019.

The spelling of 25505979 in words is "twenty-five million, five hundred five thousand, nine hundred seventy-nine".