2561122511 has 4 divisors (see below), whose sum is σ = 2564091072. Its totient is φ = 2558153952.

The previous prime is 2561122493. The next prime is 2561122517. The reversal of 2561122511 is 1152211652.

2561122511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2561122511 - 2¹⁴ = 2561106127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561122517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1482986 + ... + 1484711.

It is an arithmetic number, because the mean of its divisors is an integer number (641022768).

Almost surely, 2^2561122511 is an apocalyptic number.

2561122511 is a deficient number, since it is larger than the sum of its proper divisors (2968561).

2561122511 is an equidigital number, since it uses as much as digits as its factorization.

2561122511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2968560.

The product of its digits is 1200, while the sum is 26.

The square root of 2561122511 is about 50607.5341327751. The cubic root of 2561122511 is about 1368.1806725839.

The spelling of 2561122511 in words is "two billion, five hundred sixty-one million, one hundred twenty-two thousand, five hundred eleven".