25217197 has 2 divisors, whose sum is σ = 25217198. Its totient is φ = 25217196.

The previous prime is 25217191. The next prime is 25217201. The reversal of 25217197 is 79171252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14333796 + 10883401 = 3786^2 + 3299^2 .

It is a cyclic number.

It is not a de Polignac number, because 25217197 - 2³ = 25217189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25217191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12608598 + 12608599.

It is an arithmetic number, because the mean of its divisors is an integer number (12608599).

Almost surely, 2^25217197 is an apocalyptic number.

It is an amenable number.

25217197 is a deficient number, since it is larger than the sum of its proper divisors (1).

25217197 is an equidigital number, since it uses as much as digits as its factorization.

25217197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8820, while the sum is 34.

The square root of 25217197 is about 5021.6727292806. The cubic root of 25217197 is about 293.2461171780.

The spelling of 25217197 in words is "twenty-five million, two hundred seventeen thousand, one hundred ninety-seven".