25479881 has 4 divisors (see below), whose sum is σ = 29119872. Its totient is φ = 21839892.

The previous prime is 25479877. The next prime is 25479907. The reversal of 25479881 is 18897452.

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 25479881 - 2² = 25479877 is a prime.

It is a super-2 number, since 2×25479881² = 1298448671548322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25479851) 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 in 3 ways as a sum of consecutive naturals, for example, 1819985 + ... + 1819998.

It is an arithmetic number, because the mean of its divisors is an integer number (7279968).

Almost surely, 2^25479881 is an apocalyptic number.

It is an amenable number.

25479881 is a deficient number, since it is larger than the sum of its proper divisors (3639991).

25479881 is an equidigital number, since it uses as much as digits as its factorization.

25479881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3639990.

The product of its digits is 161280, while the sum is 44.

The square root of 25479881 is about 5047.7599982567. The cubic root of 25479881 is about 294.2608364370.

The spelling of 25479881 in words is "twenty-five million, four hundred seventy-nine thousand, eight hundred eighty-one".