25390217 has 2 divisors, whose sum is σ = 25390218. Its totient is φ = 25390216.

The previous prime is 25390207. The next prime is 25390223. The reversal of 25390217 is 71209352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25210441 + 179776 = 5021^2 + 424^2 .

It is a cyclic number.

It is not a de Polignac number, because 25390217 - 2⁴ = 25390201 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25390217.

It is not a weakly prime, because it can be changed into another prime (25390207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12695108 + 12695109.

It is an arithmetic number, because the mean of its divisors is an integer number (12695109).

Almost surely, 2^25390217 is an apocalyptic number.

It is an amenable number.

25390217 is a deficient number, since it is larger than the sum of its proper divisors (1).

25390217 is an equidigital number, since it uses as much as digits as its factorization.

25390217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 25390217 is about 5038.8706075866. The cubic root of 25390217 is about 293.9152616477.

Adding to 25390217 its reverse (71209352), we get a palindrome (96599569).

The spelling of 25390217 in words is "twenty-five million, three hundred ninety thousand, two hundred seventeen".