25434989 has 2 divisors, whose sum is σ = 25434990. Its totient is φ = 25434988.

The previous prime is 25434961. The next prime is 25434991. The reversal of 25434989 is 98943452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25421764 + 13225 = 5042^2 + 115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25434989 is a prime.

Together with 25434991, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25434949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12717494 + 12717495.

It is an arithmetic number, because the mean of its divisors is an integer number (12717495).

Almost surely, 2^25434989 is an apocalyptic number.

It is an amenable number.

25434989 is a deficient number, since it is larger than the sum of its proper divisors (1).

25434989 is an equidigital number, since it uses as much as digits as its factorization.

25434989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 44.

The square root of 25434989 is about 5043.3113130165. The cubic root of 25434989 is about 294.0879193146.

The spelling of 25434989 in words is "twenty-five million, four hundred thirty-four thousand, nine hundred eighty-nine".