25679021 has 2 divisors, whose sum is σ = 25679022. Its totient is φ = 25679020.

The previous prime is 25679011. The next prime is 25679047. The reversal of 25679021 is 12097652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24700900 + 978121 = 4970^2 + 989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25679021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25679011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12839510 + 12839511.

It is an arithmetic number, because the mean of its divisors is an integer number (12839511).

Almost surely, 2^25679021 is an apocalyptic number.

It is an amenable number.

25679021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25679021 is an equidigital number, since it uses as much as digits as its factorization.

25679021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 25679021 is about 5067.4471876873. The cubic root of 25679021 is about 295.0254540901.

The spelling of 25679021 in words is "twenty-five million, six hundred seventy-nine thousand, twenty-one".