25250991 has 8 divisors (see below), whose sum is σ = 34046640. Its totient is φ = 16644672.

The previous prime is 25250977. The next prime is 25250999. The reversal of 25250991 is 19905252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25250991 - 2¹⁵ = 25218223 is a prime.

It is a super-2 number, since 2×25250991² = 1275225092964162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25250999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47020 + ... + 47553.

It is an arithmetic number, because the mean of its divisors is an integer number (4255830).

Almost surely, 2^25250991 is an apocalyptic number.

25250991 is a deficient number, since it is larger than the sum of its proper divisors (8795649).

25250991 is an equidigital number, since it uses as much as digits as its factorization.

25250991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94665.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 25250991 is about 5025.0364177785. The cubic root of 25250991 is about 293.3770534294.

The spelling of 25250991 in words is "twenty-five million, two hundred fifty thousand, nine hundred ninety-one".