25171957 has 2 divisors, whose sum is σ = 25171958. Its totient is φ = 25171956.

The previous prime is 25171943. The next prime is 25171961. The reversal of 25171957 is 75917152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13942756 + 11229201 = 3734^2 + 3351^2 .

It is a cyclic number.

It is not a de Polignac number, because 25171957 - 2⁷ = 25171829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25171987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12585978 + 12585979.

It is an arithmetic number, because the mean of its divisors is an integer number (12585979).

Almost surely, 2^25171957 is an apocalyptic number.

It is an amenable number.

25171957 is a deficient number, since it is larger than the sum of its proper divisors (1).

25171957 is an equidigital number, since it uses as much as digits as its factorization.

25171957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22050, while the sum is 37.

The square root of 25171957 is about 5017.1662320477. The cubic root of 25171957 is about 293.0706496765.

The spelling of 25171957 in words is "twenty-five million, one hundred seventy-one thousand, nine hundred fifty-seven".