25089991 has 4 divisors (see below), whose sum is σ = 25701984. Its totient is φ = 24478000.

The previous prime is 25089973. The next prime is 25089997. The reversal of 25089991 is 19998052.

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 25089991 - 2⁷ = 25089863 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 (25089997) 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, 305935 + ... + 306016.

It is an arithmetic number, because the mean of its divisors is an integer number (6425496).

Almost surely, 2^25089991 is an apocalyptic number.

25089991 is a deficient number, since it is larger than the sum of its proper divisors (611993).

25089991 is an equidigital number, since it uses as much as digits as its factorization.

25089991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611992.

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 25089991 is about 5008.9910161628. The cubic root of 25089991 is about 292.7522007272.

The spelling of 25089991 in words is "twenty-five million, eighty-nine thousand, nine hundred ninety-one".