25253821 has 2 divisors, whose sum is σ = 25253822. Its totient is φ = 25253820.

The previous prime is 25253807. The next prime is 25253843. The reversal of 25253821 is 12835252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17131321 + 8122500 = 4139^2 + 2850^2 .

It is a cyclic number.

It is not a de Polignac number, because 25253821 - 2⁹ = 25253309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25253821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25253801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12626910 + 12626911.

It is an arithmetic number, because the mean of its divisors is an integer number (12626911).

Almost surely, 2^25253821 is an apocalyptic number.

It is an amenable number.

25253821 is a deficient number, since it is larger than the sum of its proper divisors (1).

25253821 is an equidigital number, since it uses as much as digits as its factorization.

25253821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 28.

The square root of 25253821 is about 5025.3179998882. The cubic root of 25253821 is about 293.3880130791.

The spelling of 25253821 in words is "twenty-five million, two hundred fifty-three thousand, eight hundred twenty-one".