25740521 has 2 divisors, whose sum is σ = 25740522. Its totient is φ = 25740520.

The previous prime is 25740511. The next prime is 25740569. The reversal of 25740521 is 12504752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19669225 + 6071296 = 4435^2 + 2464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25740521 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25740511) 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, 12870260 + 12870261.

It is an arithmetic number, because the mean of its divisors is an integer number (12870261).

Almost surely, 2^25740521 is an apocalyptic number.

It is an amenable number.

25740521 is a deficient number, since it is larger than the sum of its proper divisors (1).

25740521 is an equidigital number, since it uses as much as digits as its factorization.

25740521 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 25740521 is about 5073.5117029529. The cubic root of 25740521 is about 295.2607901640.

The spelling of 25740521 in words is "twenty-five million, seven hundred forty thousand, five hundred twenty-one".