25190891 has 4 divisors (see below), whose sum is σ = 27480984. Its totient is φ = 22900800.

The previous prime is 25190887. The next prime is 25190897. The reversal of 25190891 is 19809152.

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 25190891 - 2² = 25190887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25190897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1145030 + ... + 1145051.

It is an arithmetic number, because the mean of its divisors is an integer number (6870246).

Almost surely, 2^25190891 is an apocalyptic number.

25190891 is a deficient number, since it is larger than the sum of its proper divisors (2290093).

25190891 is a wasteful number, since it uses less digits than its factorization.

25190891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2290092.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 25190891 is about 5019.0527990847. The cubic root of 25190891 is about 293.1441124982.

The spelling of 25190891 in words is "twenty-five million, one hundred ninety thousand, eight hundred ninety-one".