25505281 has 8 divisors (see below), whose sum is σ = 26399744. Its totient is φ = 24615360.

The previous prime is 25505279. The next prime is 25505299. The reversal of 25505281 is 18250552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25505281 - 2¹ = 25505279 is a prime.

It is a super-2 number, since 2×25505281² = 1301038717777922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25505231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13465 + ... + 15241.

It is an arithmetic number, because the mean of its divisors is an integer number (3299968).

Almost surely, 2^25505281 is an apocalyptic number.

It is an amenable number.

25505281 is a deficient number, since it is larger than the sum of its proper divisors (894463).

25505281 is a wasteful number, since it uses less digits than its factorization.

25505281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 25505281 is about 5050.2753390286. The cubic root of 25505281 is about 294.3585834009.

The spelling of 25505281 in words is "twenty-five million, five hundred five thousand, two hundred eighty-one".