25439851 has 2 divisors, whose sum is σ = 25439852. Its totient is φ = 25439850.

The previous prime is 25439761. The next prime is 25439881. The reversal of 25439851 is 15893452.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25439851 - 2¹¹ = 25437803 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25439851.

It is not a weakly prime, because it can be changed into another prime (25439881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12719925 + 12719926.

It is an arithmetic number, because the mean of its divisors is an integer number (12719926).

Almost surely, 2^25439851 is an apocalyptic number.

25439851 is a deficient number, since it is larger than the sum of its proper divisors (1).

25439851 is an equidigital number, since it uses as much as digits as its factorization.

25439851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 37.

The square root of 25439851 is about 5043.7933145600. The cubic root of 25439851 is about 294.1066568152.

The spelling of 25439851 in words is "twenty-five million, four hundred thirty-nine thousand, eight hundred fifty-one".