25704521 has 2 divisors, whose sum is σ = 25704522. Its totient is φ = 25704520.

The previous prime is 25704517. The next prime is 25704557. The reversal of 25704521 is 12540752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19891600 + 5812921 = 4460^2 + 2411^2 .

It is a cyclic number.

It is not a de Polignac number, because 25704521 - 2² = 25704517 is a prime.

It is not a weakly prime, because it can be changed into another prime (25704571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12852260 + 12852261.

It is an arithmetic number, because the mean of its divisors is an integer number (12852261).

Almost surely, 2^25704521 is an apocalyptic number.

It is an amenable number.

25704521 is a deficient number, since it is larger than the sum of its proper divisors (1).

25704521 is an equidigital number, since it uses as much as digits as its factorization.

25704521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 25704521 is about 5069.9626231364. The cubic root of 25704521 is about 295.1230780120.

The spelling of 25704521 in words is "twenty-five million, seven hundred four thousand, five hundred twenty-one".