2505643939 has 2 divisors, whose sum is σ = 2505643940. Its totient is φ = 2505643938.

The previous prime is 2505643909. The next prime is 2505643949. The reversal of 2505643939 is 9393465052.

2505643939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2505643939 is a prime.

It is not a weakly prime, because it can be changed into another prime (2505643909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1252821969 + 1252821970.

It is an arithmetic number, because the mean of its divisors is an integer number (1252821970).

Almost surely, 2^2505643939 is an apocalyptic number.

2505643939 is a deficient number, since it is larger than the sum of its proper divisors (1).

2505643939 is an equidigital number, since it uses as much as digits as its factorization.

2505643939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 874800, while the sum is 46.

The square root of 2505643939 is about 50056.4075718584. The cubic root of 2505643939 is about 1358.2293745104.

The spelling of 2505643939 in words is "two billion, five hundred five million, six hundred forty-three thousand, nine hundred thirty-nine".