25555281 has 4 divisors (see below), whose sum is σ = 34073712. Its totient is φ = 17036852.

The previous prime is 25555261. The next prime is 25555291. The reversal of 25555281 is 18255552.

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 25555281 - 2⁵ = 25555249 is a prime.

It is a super-2 number, since 2×25555281² = 1306144773977922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25555241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4259211 + ... + 4259216.

It is an arithmetic number, because the mean of its divisors is an integer number (8518428).

Almost surely, 2^25555281 is an apocalyptic number.

It is an amenable number.

25555281 is a deficient number, since it is larger than the sum of its proper divisors (8518431).

25555281 is an equidigital number, since it uses as much as digits as its factorization.

25555281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8518430.

The product of its digits is 20000, while the sum is 33.

The square root of 25555281 is about 5055.2231404756. The cubic root of 25555281 is about 294.5508092392.

The spelling of 25555281 in words is "twenty-five million, five hundred fifty-five thousand, two hundred eighty-one".