25529989 has 2 divisors, whose sum is σ = 25529990. Its totient is φ = 25529988.

The previous prime is 25529953. The next prime is 25529993. The reversal of 25529989 is 98992552.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22137025 + 3392964 = 4705^2 + 1842^2 .

It is a cyclic number.

It is not a de Polignac number, because 25529989 - 2¹¹ = 25527941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25529929) 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, 12764994 + 12764995.

It is an arithmetic number, because the mean of its divisors is an integer number (12764995).

Almost surely, 2^25529989 is an apocalyptic number.

It is an amenable number.

25529989 is a deficient number, since it is larger than the sum of its proper divisors (1).

25529989 is an equidigital number, since it uses as much as digits as its factorization.

25529989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 49.

The square root of 25529989 is about 5052.7209501416. The cubic root of 25529989 is about 294.4536050893.

The spelling of 25529989 in words is "twenty-five million, five hundred twenty-nine thousand, nine hundred eighty-nine".