25391297 has 2 divisors, whose sum is σ = 25391298. Its totient is φ = 25391296.

The previous prime is 25391243. The next prime is 25391309. The reversal of 25391297 is 79219352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24216241 + 1175056 = 4921^2 + 1084^2 .

It is a cyclic number.

It is not a de Polignac number, because 25391297 - 2¹⁰ = 25390273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25391297.

It is not a weakly prime, because it can be changed into another prime (25391227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12695648 + 12695649.

It is an arithmetic number, because the mean of its divisors is an integer number (12695649).

Almost surely, 2^25391297 is an apocalyptic number.

It is an amenable number.

25391297 is a deficient number, since it is larger than the sum of its proper divisors (1).

25391297 is an equidigital number, since it uses as much as digits as its factorization.

25391297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34020, while the sum is 38.

The square root of 25391297 is about 5038.9777733187. The cubic root of 25391297 is about 293.9194289218.

The spelling of 25391297 in words is "twenty-five million, three hundred ninety-one thousand, two hundred ninety-seven".