2561261039 has 2 divisors, whose sum is σ = 2561261040. Its totient is φ = 2561261038.

The previous prime is 2561260973. The next prime is 2561261069. The reversal of 2561261039 is 9301621652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2561261039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561261069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280630519 + 1280630520.

It is an arithmetic number, because the mean of its divisors is an integer number (1280630520).

Almost surely, 2^2561261039 is an apocalyptic number.

2561261039 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561261039 is an equidigital number, since it uses as much as digits as its factorization.

2561261039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 2561261039 is about 50608.9027642370. The cubic root of 2561261039 is about 1368.2053398817.

The spelling of 2561261039 in words is "two billion, five hundred sixty-one million, two hundred sixty-one thousand, thirty-nine".