25529321 has 2 divisors, whose sum is σ = 25529322. Its totient is φ = 25529320.

The previous prime is 25529311. The next prime is 25529327. The reversal of 25529321 is 12392552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24403600 + 1125721 = 4940^2 + 1061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25529321 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25529327) 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, 12764660 + 12764661.

It is an arithmetic number, because the mean of its divisors is an integer number (12764661).

Almost surely, 2^25529321 is an apocalyptic number.

It is an amenable number.

25529321 is a deficient number, since it is larger than the sum of its proper divisors (1).

25529321 is an equidigital number, since it uses as much as digits as its factorization.

25529321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5400, while the sum is 29.

The square root of 25529321 is about 5052.6548467118. The cubic root of 25529321 is about 294.4510369105.

The spelling of 25529321 in words is "twenty-five million, five hundred twenty-nine thousand, three hundred twenty-one".