2818112561 has 4 divisors (see below), whose sum is σ = 3074304624. Its totient is φ = 2561920500.

The previous prime is 2818112503. The next prime is 2818112597. The reversal of 2818112561 is 1652118182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2818112561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2818112501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128096015 + ... + 128096036.

It is an arithmetic number, because the mean of its divisors is an integer number (768576156).

Almost surely, 2^2818112561 is an apocalyptic number.

It is an amenable number.

2818112561 is a deficient number, since it is larger than the sum of its proper divisors (256192063).

2818112561 is a wasteful number, since it uses less digits than its factorization.

2818112561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256192062.

The product of its digits is 7680, while the sum is 35.

The square root of 2818112561 is about 53085.8979485136. The cubic root of 2818112561 is about 1412.4923744700.

The spelling of 2818112561 in words is "two billion, eight hundred eighteen million, one hundred twelve thousand, five hundred sixty-one".