25064821 has 2 divisors, whose sum is σ = 25064822. Its totient is φ = 25064820.

The previous prime is 25064807. The next prime is 25064827. The reversal of 25064821 is 12846052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23716900 + 1347921 = 4870^2 + 1161^2 .

It is a cyclic number.

It is not a de Polignac number, because 25064821 - 2⁷ = 25064693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25064821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25064827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12532410 + 12532411.

It is an arithmetic number, because the mean of its divisors is an integer number (12532411).

Almost surely, 2^25064821 is an apocalyptic number.

It is an amenable number.

25064821 is a deficient number, since it is larger than the sum of its proper divisors (1).

25064821 is an equidigital number, since it uses as much as digits as its factorization.

25064821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 25064821 is about 5006.4779036764. The cubic root of 25064821 is about 292.6542727222.

The spelling of 25064821 in words is "twenty-five million, sixty-four thousand, eight hundred twenty-one".