2115818281 has 2 divisors, whose sum is σ = 2115818282. Its totient is φ = 2115818280.

The previous prime is 2115818269. The next prime is 2115818297. The reversal of 2115818281 is 1828185112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1191354256 + 924464025 = 34516^2 + 30405^2 .

It is a cyclic number.

It is not a de Polignac number, because 2115818281 - 2²⁷ = 1981600553 is a prime.

It is a super-2 number, since 2×2115818281² = 8953373996427589922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2115818281.

It is not a weakly prime, because it can be changed into another prime (2115818381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1057909140 + 1057909141.

It is an arithmetic number, because the mean of its divisors is an integer number (1057909141).

Almost surely, 2^2115818281 is an apocalyptic number.

It is an amenable number.

2115818281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115818281 is an equidigital number, since it uses as much as digits as its factorization.

2115818281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10240, while the sum is 37.

The square root of 2115818281 is about 45998.0247510695. The cubic root of 2115818281 is about 1283.7864525911.

The spelling of 2115818281 in words is "two billion, one hundred fifteen million, eight hundred eighteen thousand, two hundred eighty-one".