25217191 has 2 divisors, whose sum is σ = 25217192. Its totient is φ = 25217190.

The previous prime is 25217189. The next prime is 25217197. The reversal of 25217191 is 19171252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25217191 - 2¹ = 25217189 is a prime.

Together with 25217189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25217197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12608595 + 12608596.

It is an arithmetic number, because the mean of its divisors is an integer number (12608596).

Almost surely, 2^25217191 is an apocalyptic number.

25217191 is a deficient number, since it is larger than the sum of its proper divisors (1).

25217191 is an equidigital number, since it uses as much as digits as its factorization.

25217191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 28.

The square root of 25217191 is about 5021.6721318700. The cubic root of 25217191 is about 293.2460939204.

The spelling of 25217191 in words is "twenty-five million, two hundred seventeen thousand, one hundred ninety-one".