25653521 has 2 divisors, whose sum is σ = 25653522. Its totient is φ = 25653520.

The previous prime is 25653517. The next prime is 25653547. The reversal of 25653521 is 12535652.

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., 21752896 + 3900625 = 4664^2 + 1975^2 .

It is a cyclic number.

It is not a de Polignac number, because 25653521 - 2² = 25653517 is a prime.

It is not a weakly prime, because it can be changed into another prime (25653581) 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, 12826760 + 12826761.

It is an arithmetic number, because the mean of its divisors is an integer number (12826761).

Almost surely, 2^25653521 is an apocalyptic number.

It is an amenable number.

25653521 is a deficient number, since it is larger than the sum of its proper divisors (1).

25653521 is an equidigital number, since it uses as much as digits as its factorization.

25653521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9000, while the sum is 29.

The square root of 25653521 is about 5064.9305029783. The cubic root of 25653521 is about 294.9277655180.

The spelling of 25653521 in words is "twenty-five million, six hundred fifty-three thousand, five hundred twenty-one".