2561371331 has 2 divisors, whose sum is σ = 2561371332. Its totient is φ = 2561371330.

The previous prime is 2561371289. The next prime is 2561371381. The reversal of 2561371331 is 1331731652.

2561371331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2561371331 - 2¹⁴ = 2561354947 is a prime.

It is a super-2 number, since 2×2561371331² = 13121246190537423122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2561371381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280685665 + 1280685666.

It is an arithmetic number, because the mean of its divisors is an integer number (1280685666).

Almost surely, 2^2561371331 is an apocalyptic number.

2561371331 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561371331 is an equidigital number, since it uses as much as digits as its factorization.

2561371331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 32.

The square root of 2561371331 is about 50609.9924026866. The cubic root of 2561371331 is about 1368.2249786371.

The spelling of 2561371331 in words is "two billion, five hundred sixty-one million, three hundred seventy-one thousand, three hundred thirty-one".