2561099 has 2 divisors, whose sum is σ = 2561100. Its totient is φ = 2561098.

The previous prime is 2561093. The next prime is 2561129. The reversal of 2561099 is 9901652.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2561099 is a prime.

It is not a weakly prime, because it can be changed into another prime (2561093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280549 + 1280550.

It is an arithmetic number, because the mean of its divisors is an integer number (1280550).

2^2561099 is an apocalyptic number.

2561099 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561099 is an equidigital number, since it uses as much as digits as its factorization.

2561099 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 32.

The square root of 2561099 is about 1600.3434006487. The cubic root of 2561099 is about 136.8176485957.

The spelling of 2561099 in words is "two million, five hundred sixty-one thousand, ninety-nine".