25775917 has 2 divisors, whose sum is σ = 25775918. Its totient is φ = 25775916.

The previous prime is 25775903. The next prime is 25775947. The reversal of 25775917 is 71957752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24265476 + 1510441 = 4926^2 + 1229^2 .

It is a cyclic number.

It is not a de Polignac number, because 25775917 - 2²³ = 17387309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25775947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12887958 + 12887959.

It is an arithmetic number, because the mean of its divisors is an integer number (12887959).

Almost surely, 2^25775917 is an apocalyptic number.

It is an amenable number.

25775917 is a deficient number, since it is larger than the sum of its proper divisors (1).

25775917 is an equidigital number, since it uses as much as digits as its factorization.

25775917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 154350, while the sum is 43.

The square root of 25775917 is about 5076.9988181996. The cubic root of 25775917 is about 295.3960666819.

The spelling of 25775917 in words is "twenty-five million, seven hundred seventy-five thousand, nine hundred seventeen".