25504989 has 4 divisors (see below), whose sum is σ = 34006656. Its totient is φ = 17003324.

The previous prime is 25504979. The next prime is 25504991. The reversal of 25504989 is 98940552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25504989 - 2⁹ = 25504477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25504989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25504939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4250829 + ... + 4250834.

It is an arithmetic number, because the mean of its divisors is an integer number (8501664).

Almost surely, 2^25504989 is an apocalyptic number.

It is an amenable number.

25504989 is a deficient number, since it is larger than the sum of its proper divisors (8501667).

25504989 is an equidigital number, since it uses as much as digits as its factorization.

25504989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8501666.

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 25504989 is about 5050.2464296309. The cubic root of 25504989 is about 294.3574600645.

The spelling of 25504989 in words is "twenty-five million, five hundred four thousand, nine hundred eighty-nine".