25920191 has 4 divisors (see below), whose sum is σ = 28276584. Its totient is φ = 23563800.

The previous prime is 25920187. The next prime is 25920203. The reversal of 25920191 is 19102952.

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 25920191 - 2² = 25920187 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 (25920131) 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, 1178180 + ... + 1178201.

It is an arithmetic number, because the mean of its divisors is an integer number (7069146).

Almost surely, 2^25920191 is an apocalyptic number.

25920191 is a deficient number, since it is larger than the sum of its proper divisors (2356393).

25920191 is a wasteful number, since it uses less digits than its factorization.

25920191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356392.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 25920191 is about 5091.1875824801. The cubic root of 25920191 is about 295.9461758415.

The spelling of 25920191 in words is "twenty-five million, nine hundred twenty thousand, one hundred ninety-one".