2115564281 has 16 divisors (see below), whose sum is σ = 2205475008. Its totient is φ = 2027592000.

The previous prime is 2115564257. The next prime is 2115564299. The reversal of 2115564281 is 1824655112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2115564281 is a prime.

It is a super-2 number, since 2×2115564281² = 8951224454086093922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2115566281) 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 15 ways as a sum of consecutive naturals, for example, 787166 + ... + 789848.

It is an arithmetic number, because the mean of its divisors is an integer number (137842188).

Almost surely, 2^2115564281 is an apocalyptic number.

It is an amenable number.

2115564281 is a deficient number, since it is larger than the sum of its proper divisors (89910727).

2115564281 is a wasteful number, since it uses less digits than its factorization.

2115564281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032.

The product of its digits is 19200, while the sum is 35.

The square root of 2115564281 is about 45995.2636800791. The cubic root of 2115564281 is about 1283.7350784866.

The spelling of 2115564281 in words is "two billion, one hundred fifteen million, five hundred sixty-four thousand, two hundred eighty-one".