25217285 has 4 divisors (see below), whose sum is σ = 30260748. Its totient is φ = 20173824.

The previous prime is 25217279. The next prime is 25217299. The reversal of 25217285 is 58271252.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19351201 + 5866084 = 4399^2 + 2422^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25217285 is a prime.

It is a super-2 number, since 2×25217285² = 1271822925542450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2521724 + ... + 2521733.

It is an arithmetic number, because the mean of its divisors is an integer number (7565187).

Almost surely, 2^25217285 is an apocalyptic number.

It is an amenable number.

25217285 is a deficient number, since it is larger than the sum of its proper divisors (5043463).

25217285 is an equidigital number, since it uses as much as digits as its factorization.

25217285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5043462.

The product of its digits is 11200, while the sum is 32.

The square root of 25217285 is about 5021.6814912935. The cubic root of 25217285 is about 293.2464582895.

The spelling of 25217285 in words is "twenty-five million, two hundred seventeen thousand, two hundred eighty-five".