2561304611 has 2 divisors, whose sum is σ = 2561304612. Its totient is φ = 2561304610.

The previous prime is 2561304593. The next prime is 2561304667. The reversal of 2561304611 is 1164031652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2561304611 - 2⁶ = 2561304547 is a prime.

It is a super-2 number, since 2×2561304611² = 13120562620659722642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2561300611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280652305 + 1280652306.

It is an arithmetic number, because the mean of its divisors is an integer number (1280652306).

Almost surely, 2^2561304611 is an apocalyptic number.

2561304611 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561304611 is an equidigital number, since it uses as much as digits as its factorization.

2561304611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 2561304611 is about 50609.3332400260. Note that the first 3 decimals coincide. The cubic root of 2561304611 is about 1368.2130984434.

The spelling of 2561304611 in words is "two billion, five hundred sixty-one million, three hundred four thousand, six hundred eleven".