25217281 has 4 divisors (see below), whose sum is σ = 25306672. Its totient is φ = 25127892.

The previous prime is 25217279. The next prime is 25217299. The reversal of 25217281 is 18271252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25217281 - 2¹ = 25217279 is a prime.

It is a super-2 number, since 2×25217281² = 1271822522065922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25217201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44271 + ... + 44836.

It is an arithmetic number, because the mean of its divisors is an integer number (6326668).

Almost surely, 2^25217281 is an apocalyptic number.

It is an amenable number.

25217281 is a deficient number, since it is larger than the sum of its proper divisors (89391).

25217281 is an equidigital number, since it uses as much as digits as its factorization.

25217281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89390.

The product of its digits is 2240, while the sum is 28.

The square root of 25217281 is about 5021.6810930205. The cubic root of 25217281 is about 293.2464427844.

The spelling of 25217281 in words is "twenty-five million, two hundred seventeen thousand, two hundred eighty-one".