25239881 has 2 divisors, whose sum is σ = 25239882. Its totient is φ = 25239880.

The previous prime is 25239871. The next prime is 25239937. The reversal of 25239881 is 18893252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24010000 + 1229881 = 4900^2 + 1109^2 .

It is a cyclic number.

It is not a de Polignac number, because 25239881 - 2¹⁸ = 24977737 is a prime.

It is a super-2 number, since 2×25239881² = 1274103185788322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25239821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12619940 + 12619941.

It is an arithmetic number, because the mean of its divisors is an integer number (12619941).

Almost surely, 2^25239881 is an apocalyptic number.

It is an amenable number.

25239881 is a deficient number, since it is larger than the sum of its proper divisors (1).

25239881 is an equidigital number, since it uses as much as digits as its factorization.

25239881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 38.

The square root of 25239881 is about 5023.9308315302. The cubic root of 25239881 is about 293.3340201717.

The spelling of 25239881 in words is "twenty-five million, two hundred thirty-nine thousand, eight hundred eighty-one".