25641881 has 4 divisors (see below), whose sum is σ = 25674852. Its totient is φ = 25608912.

The previous prime is 25641871. The next prime is 25641911. The reversal of 25641881 is 18814652.

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 11323225 + 14318656 = 3365^2 + 3784^2 .

It is a cyclic number.

It is not a de Polignac number, because 25641881 - 2¹⁸ = 25379737 is a prime.

It is a super-2 number, since 2×25641881² = 1315012122436322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25641821) 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, 15290 + ... + 16883.

It is an arithmetic number, because the mean of its divisors is an integer number (6418713).

Almost surely, 2^25641881 is an apocalyptic number.

It is an amenable number.

25641881 is a deficient number, since it is larger than the sum of its proper divisors (32971).

25641881 is an equidigital number, since it uses as much as digits as its factorization.

25641881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32970.

The product of its digits is 15360, while the sum is 35.

The square root of 25641881 is about 5063.7812946453. The cubic root of 25641881 is about 294.8831520379.

The spelling of 25641881 in words is "twenty-five million, six hundred forty-one thousand, eight hundred eighty-one".