25591589 has 2 divisors, whose sum is σ = 25591590. Its totient is φ = 25591588.

The previous prime is 25591583. The next prime is 25591591. The reversal of 25591589 is 98519552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23136100 + 2455489 = 4810^2 + 1567^2 .

It is a cyclic number.

It is not a de Polignac number, because 25591589 - 2⁸ = 25591333 is a prime.

Together with 25591591, 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 (25591583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12795794 + 12795795.

It is an arithmetic number, because the mean of its divisors is an integer number (12795795).

Almost surely, 2^25591589 is an apocalyptic number.

It is an amenable number.

25591589 is a deficient number, since it is larger than the sum of its proper divisors (1).

25591589 is an equidigital number, since it uses as much as digits as its factorization.

25591589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162000, while the sum is 44.

The square root of 25591589 is about 5058.8130030670. The cubic root of 25591589 is about 294.6902388671.

It can be divided in two parts, 255 and 91589, that multiplied together give a triangular number (23355195 = T₆₈₃₄).

The spelling of 25591589 in words is "twenty-five million, five hundred ninety-one thousand, five hundred eighty-nine".