25315817 has 2 divisors, whose sum is σ = 25315818. Its totient is φ = 25315816.

The previous prime is 25315781. The next prime is 25315837. The reversal of 25315817 is 71851352.

Together with previous prime (25315781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15649936 + 9665881 = 3956^2 + 3109^2 .

It is a cyclic number.

It is not a de Polignac number, because 25315817 - 2¹² = 25311721 is a prime.

It is not a weakly prime, because it can be changed into another prime (25315837) 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, 12657908 + 12657909.

It is an arithmetic number, because the mean of its divisors is an integer number (12657909).

Almost surely, 2^25315817 is an apocalyptic number.

It is an amenable number.

25315817 is a deficient number, since it is larger than the sum of its proper divisors (1).

25315817 is an equidigital number, since it uses as much as digits as its factorization.

25315817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 32.

The square root of 25315817 is about 5031.4825846861. The cubic root of 25315817 is about 293.6278978272.

The spelling of 25315817 in words is "twenty-five million, three hundred fifteen thousand, eight hundred seventeen".