2505989 has 2 divisors, whose sum is σ = 2505990. Its totient is φ = 2505988.

The previous prime is 2505983. The next prime is 2505991. The reversal of 2505989 is 9895052.

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., 2505889 + 100 = 1583^2 + 10^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2505989 is a prime.

Together with 2505991, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2505983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1252994 + 1252995.

It is an arithmetic number, because the mean of its divisors is an integer number (1252995).

2^2505989 is an apocalyptic number.

It is an amenable number.

2505989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2505989 is an equidigital number, since it uses as much as digits as its factorization.

2505989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 2505989 is about 1583.0315852819. The cubic root of 2505989 is about 135.8291720489.

The spelling of 2505989 in words is "two million, five hundred five thousand, nine hundred eighty-nine".