25171901 has 2 divisors, whose sum is σ = 25171902. Its totient is φ = 25171900.

The previous prime is 25171897. The next prime is 25171943. The reversal of 25171901 is 10917152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20484676 + 4687225 = 4526^2 + 2165^2 .

It is a cyclic number.

It is not a de Polignac number, because 25171901 - 2² = 25171897 is a prime.

It is a Chen prime.

It is equal to p_1576016 and since 25171901 and 1576016 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25171961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12585950 + 12585951.

It is an arithmetic number, because the mean of its divisors is an integer number (12585951).

Almost surely, 2^25171901 is an apocalyptic number.

It is an amenable number.

25171901 is a deficient number, since it is larger than the sum of its proper divisors (1).

25171901 is an equidigital number, since it uses as much as digits as its factorization.

25171901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 25171901 is about 5017.1606512050. The cubic root of 25171901 is about 293.0704323451.

The spelling of 25171901 in words is "twenty-five million, one hundred seventy-one thousand, nine hundred one".