25956191 has 4 divisors (see below), whose sum is σ = 25982352. Its totient is φ = 25930032.

The previous prime is 25956187. The next prime is 25956193. The reversal of 25956191 is 19165952.

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 25956191 - 2² = 25956187 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 (25956193) 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, 11531 + ... + 13596.

It is an arithmetic number, because the mean of its divisors is an integer number (6495588).

Almost surely, 2^25956191 is an apocalyptic number.

25956191 is a deficient number, since it is larger than the sum of its proper divisors (26161).

25956191 is a wasteful number, since it uses less digits than its factorization.

25956191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26160.

The product of its digits is 24300, while the sum is 38.

The square root of 25956191 is about 5094.7218766092. The cubic root of 25956191 is about 296.0831235686.

The spelling of 25956191 in words is "twenty-five million, nine hundred fifty-six thousand, one hundred ninety-one".