25081439 has 2 divisors, whose sum is σ = 25081440. Its totient is φ = 25081438.

The previous prime is 25081421. The next prime is 25081471. The reversal of 25081439 is 93418052.

It is an a-pointer prime, because the next prime (25081471) can be obtained adding 25081439 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25081439 - 2²⁴ = 8304223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25081489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12540719 + 12540720.

It is an arithmetic number, because the mean of its divisors is an integer number (12540720).

Almost surely, 2^25081439 is an apocalyptic number.

25081439 is a deficient number, since it is larger than the sum of its proper divisors (1).

25081439 is an equidigital number, since it uses as much as digits as its factorization.

25081439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 25081439 is about 5008.1372784699. The cubic root of 25081439 is about 292.7189351203.

The spelling of 25081439 in words is "twenty-five million, eighty-one thousand, four hundred thirty-nine".