2113836381 has 24 divisors (see below), whose sum is σ = 3139676280. Its totient is φ = 1369460736.

The previous prime is 2113836377. The next prime is 2113836397. The reversal of 2113836381 is 1836383112.

2113836381 is a `hidden beast` number, since 2 + 1 + 13 + 8 + 3 + 638 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 15280281 + 2098556100 = 3909^2 + 45810^2 .

It is not a de Polignac number, because 2113836381 - 2² = 2113836377 is a prime.

It is a super-2 number, since 2×2113836381² = 8936608491278354322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113836301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 305941 + ... + 312773.

It is an arithmetic number, because the mean of its divisors is an integer number (130819845).

Almost surely, 2^2113836381 is an apocalyptic number.

It is an amenable number.

2113836381 is a deficient number, since it is larger than the sum of its proper divisors (1025839899).

2113836381 is a wasteful number, since it uses less digits than its factorization.

2113836381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7805 (or 7802 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 2113836381 is about 45976.4763873875. The cubic root of 2113836381 is about 1283.3854838124.

The spelling of 2113836381 in words is "two billion, one hundred thirteen million, eight hundred thirty-six thousand, three hundred eighty-one".