25754821 has 2 divisors, whose sum is σ = 25754822. Its totient is φ = 25754820.

The previous prime is 25754809. The next prime is 25754837. The reversal of 25754821 is 12845752.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22372900 + 3381921 = 4730^2 + 1839^2 .

It is a cyclic number.

It is not a de Polignac number, because 25754821 - 2⁷ = 25754693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25754851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12877410 + 12877411.

It is an arithmetic number, because the mean of its divisors is an integer number (12877411).

Almost surely, 2^25754821 is an apocalyptic number.

It is an amenable number.

25754821 is a deficient number, since it is larger than the sum of its proper divisors (1).

25754821 is an equidigital number, since it uses as much as digits as its factorization.

25754821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22400, while the sum is 34.

The square root of 25754821 is about 5074.9207875592. The cubic root of 25754821 is about 295.3154568594.

It can be divided in two parts, 2575 and 4821, that added together give a square (7396 = 86²).

The spelling of 25754821 in words is "twenty-five million, seven hundred fifty-four thousand, eight hundred twenty-one".