25320989 has 2 divisors, whose sum is σ = 25320990. Its totient is φ = 25320988.

The previous prime is 25320983. The next prime is 25320991. The reversal of 25320989 is 98902352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22372900 + 2948089 = 4730^2 + 1717^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25320989 is a prime.

Together with 25320991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25320983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12660494 + 12660495.

It is an arithmetic number, because the mean of its divisors is an integer number (12660495).

Almost surely, 2^25320989 is an apocalyptic number.

It is an amenable number.

25320989 is a deficient number, since it is larger than the sum of its proper divisors (1).

25320989 is an equidigital number, since it uses as much as digits as its factorization.

25320989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 25320989 is about 5031.9965222563. The cubic root of 25320989 is about 293.6478924427.

The spelling of 25320989 in words is "twenty-five million, three hundred twenty thousand, nine hundred eighty-nine".