25359821 has 2 divisors, whose sum is σ = 25359822. Its totient is φ = 25359820.

The previous prime is 25359791. The next prime is 25359827. The reversal of 25359821 is 12895352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17598025 + 7761796 = 4195^2 + 2786^2 .

It is a cyclic number.

It is not a de Polignac number, because 25359821 - 2⁶ = 25359757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25359827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12679910 + 12679911.

It is an arithmetic number, because the mean of its divisors is an integer number (12679911).

Almost surely, 2^25359821 is an apocalyptic number.

It is an amenable number.

25359821 is a deficient number, since it is larger than the sum of its proper divisors (1).

25359821 is an equidigital number, since it uses as much as digits as its factorization.

25359821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 35.

The square root of 25359821 is about 5035.8535522789. The cubic root of 25359821 is about 293.7979275352.

The spelling of 25359821 in words is "twenty-five million, three hundred fifty-nine thousand, eight hundred twenty-one".