25799881 has 2 divisors, whose sum is σ = 25799882. Its totient is φ = 25799880.

The previous prime is 25799861. The next prime is 25799887. The reversal of 25799881 is 18899752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20394256 + 5405625 = 4516^2 + 2325^2 .

It is a cyclic number.

It is not a de Polignac number, because 25799881 - 2⁵ = 25799849 is a prime.

It is a super-2 number, since 2×25799881² = 1331267719228322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25799887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12899940 + 12899941.

It is an arithmetic number, because the mean of its divisors is an integer number (12899941).

Almost surely, 2^25799881 is an apocalyptic number.

It is an amenable number.

25799881 is a deficient number, since it is larger than the sum of its proper divisors (1).

25799881 is an equidigital number, since it uses as much as digits as its factorization.

25799881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 49.

The square root of 25799881 is about 5079.3583256155. The cubic root of 25799881 is about 295.4875820645.

The spelling of 25799881 in words is "twenty-five million, seven hundred ninety-nine thousand, eight hundred eighty-one".