25122989 has 4 divisors (see below), whose sum is σ = 25933440. Its totient is φ = 24312540.

The previous prime is 25122971. The next prime is 25123001. The reversal of 25122989 is 98922152.

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 25122989 - 2⁸ = 25122733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25122949) 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, 405179 + ... + 405240.

It is an arithmetic number, because the mean of its divisors is an integer number (6483360).

Almost surely, 2^25122989 is an apocalyptic number.

It is an amenable number.

25122989 is a deficient number, since it is larger than the sum of its proper divisors (810451).

25122989 is an equidigital number, since it uses as much as digits as its factorization.

25122989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810450.

The product of its digits is 25920, while the sum is 38.

The square root of 25122989 is about 5012.2838107992. The cubic root of 25122989 is about 292.8804856836.

The spelling of 25122989 in words is "twenty-five million, one hundred twenty-two thousand, nine hundred eighty-nine".