25587217 has 2 divisors, whose sum is σ = 25587218. Its totient is φ = 25587216.

The previous prime is 25587209. The next prime is 25587241. The reversal of 25587217 is 71278552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13133376 + 12453841 = 3624^2 + 3529^2 .

It is a cyclic number.

It is not a de Polignac number, because 25587217 - 2³ = 25587209 is a prime.

It is not a weakly prime, because it can be changed into another prime (25587277) 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, 12793608 + 12793609.

It is an arithmetic number, because the mean of its divisors is an integer number (12793609).

Almost surely, 2^25587217 is an apocalyptic number.

It is an amenable number.

25587217 is a deficient number, since it is larger than the sum of its proper divisors (1).

25587217 is an equidigital number, since it uses as much as digits as its factorization.

25587217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39200, while the sum is 37.

The square root of 25587217 is about 5058.3808674318. The cubic root of 25587217 is about 294.6734565420.

The spelling of 25587217 in words is "twenty-five million, five hundred eighty-seven thousand, two hundred seventeen".