25229881 has 2 divisors, whose sum is σ = 25229882. Its totient is φ = 25229880.

The previous prime is 25229857. The next prime is 25229899. The reversal of 25229881 is 18892252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24403600 + 826281 = 4940^2 + 909^2 .

It is a cyclic number.

It is not a de Polignac number, because 25229881 - 2¹⁵ = 25197113 is a prime.

It is a super-2 number, since 2×25229881² = 1273093790548322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25229881.

It is not a weakly prime, because it can be changed into another prime (25239881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12614940 + 12614941.

It is an arithmetic number, because the mean of its divisors is an integer number (12614941).

Almost surely, 2^25229881 is an apocalyptic number.

It is an amenable number.

25229881 is a deficient number, since it is larger than the sum of its proper divisors (1).

25229881 is an equidigital number, since it uses as much as digits as its factorization.

25229881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 37.

The square root of 25229881 is about 5022.9354963009. The cubic root of 25229881 is about 293.2952755664.

It can be divided in two parts, 2522 and 9881, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 25229881 in words is "twenty-five million, two hundred twenty-nine thousand, eight hundred eighty-one".