25365991 has 4 divisors (see below), whose sum is σ = 28989712. Its totient is φ = 21742272.

The previous prime is 25365983. The next prime is 25365997. The reversal of 25365991 is 19956352.

It is a happy number.

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 25365991 - 2³ = 25365983 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 (25365997) 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, 1811850 + ... + 1811863.

It is an arithmetic number, because the mean of its divisors is an integer number (7247428).

Almost surely, 2^25365991 is an apocalyptic number.

25365991 is a deficient number, since it is larger than the sum of its proper divisors (3623721).

25365991 is an equidigital number, since it uses as much as digits as its factorization.

25365991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3623720.

The product of its digits is 72900, while the sum is 40.

The square root of 25365991 is about 5036.4661221932. The cubic root of 25365991 is about 293.8217524434.

The spelling of 25365991 in words is "twenty-five million, three hundred sixty-five thousand, nine hundred ninety-one".