25521679 has 2 divisors, whose sum is σ = 25521680. Its totient is φ = 25521678.

The previous prime is 25521677. The next prime is 25521701. The reversal of 25521679 is 97612552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25521679 - 2¹ = 25521677 is a prime.

Together with 25521677, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25521677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12760839 + 12760840.

It is an arithmetic number, because the mean of its divisors is an integer number (12760840).

Almost surely, 2^25521679 is an apocalyptic number.

25521679 is a deficient number, since it is larger than the sum of its proper divisors (1).

25521679 is an equidigital number, since it uses as much as digits as its factorization.

25521679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 37.

The square root of 25521679 is about 5051.8985540092. The cubic root of 25521679 is about 294.4216534500.

The spelling of 25521679 in words is "twenty-five million, five hundred twenty-one thousand, six hundred seventy-nine".