25551191 has 2 divisors, whose sum is σ = 25551192. Its totient is φ = 25551190.

The previous prime is 25551179. The next prime is 25551193. The reversal of 25551191 is 19115552.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25551191 is a prime.

It is a Sophie Germain prime.

Together with 25551193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25551193) 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 as a sum of consecutive naturals, namely, 12775595 + 12775596.

It is an arithmetic number, because the mean of its divisors is an integer number (12775596).

Almost surely, 2^25551191 is an apocalyptic number.

25551191 is a deficient number, since it is larger than the sum of its proper divisors (1).

25551191 is an equidigital number, since it uses as much as digits as its factorization.

25551191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2250, while the sum is 29.

The square root of 25551191 is about 5054.8185921950. The cubic root of 25551191 is about 294.5350945866.

The spelling of 25551191 in words is "twenty-five million, five hundred fifty-one thousand, one hundred ninety-one".