25238991 has 16 divisors (see below), whose sum is σ = 35094528. Its totient is φ = 16116000.

The previous prime is 25238977. The next prime is 25239001. The reversal of 25238991 is 19983252.

It is not a de Polignac number, because 25238991 - 2⁵ = 25238959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25238911) 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 15 ways as a sum of consecutive naturals, for example, 8050 + ... + 10736.

It is an arithmetic number, because the mean of its divisors is an integer number (2193408).

Almost surely, 2^25238991 is an apocalyptic number.

25238991 is a deficient number, since it is larger than the sum of its proper divisors (9855537).

25238991 is a wasteful number, since it uses less digits than its factorization.

25238991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2822.

The product of its digits is 38880, while the sum is 39.

The square root of 25238991 is about 5023.8422546891. The cubic root of 25238991 is about 293.3305723168.

The spelling of 25238991 in words is "twenty-five million, two hundred thirty-eight thousand, nine hundred ninety-one".