2561091019 has 2 divisors, whose sum is σ = 2561091020. Its totient is φ = 2561091018.

The previous prime is 2561091011. The next prime is 2561091079. The reversal of 2561091019 is 9101901652.

It is a happy number.

2561091019 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 2561091019 - 2³ = 2561091011 is a prime.

It is a super-2 number, since 2×2561091019² = 13118374415204916722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2561091011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280545509 + 1280545510.

It is an arithmetic number, because the mean of its divisors is an integer number (1280545510).

Almost surely, 2^2561091019 is an apocalyptic number.

2561091019 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561091019 is an equidigital number, since it uses as much as digits as its factorization.

2561091019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 34.

The square root of 2561091019 is about 50607.2229923753. Note that the first 3 decimals coincide. The cubic root of 2561091019 is about 1368.1750647665.

The spelling of 2561091019 in words is "two billion, five hundred sixty-one million, ninety-one thousand, nineteen".