25709851 has 2 divisors, whose sum is σ = 25709852. Its totient is φ = 25709850.

The previous prime is 25709821. The next prime is 25709861. The reversal of 25709851 is 15890752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25709851 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25709851.

It is not a weakly prime, because it can be changed into another prime (25709821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12854925 + 12854926.

It is an arithmetic number, because the mean of its divisors is an integer number (12854926).

Almost surely, 2^25709851 is an apocalyptic number.

25709851 is a deficient number, since it is larger than the sum of its proper divisors (1).

25709851 is an equidigital number, since it uses as much as digits as its factorization.

25709851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 25709851 is about 5070.4882407910. The cubic root of 25709851 is about 295.1434751670.

It can be divided in two parts, 2570 and 9851, that added together give a palindrome (12421).

The spelling of 25709851 in words is "twenty-five million, seven hundred nine thousand, eight hundred fifty-one".