2118823581 has 32 divisors (see below), whose sum is σ = 3312010240. Its totient is φ = 1179650304.

The previous prime is 2118823579. The next prime is 2118823583. The reversal of 2118823581 is 1853288112.

It is an interprime number because it is at equal distance from previous prime (2118823579) and next prime (2118823583).

It is not a de Polignac number, because 2118823581 - 2¹ = 2118823579 is a prime.

It is a super-2 number, since 2×2118823581² = 8978826734803327122, 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 (2118823583) 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 31 ways as a sum of consecutive naturals, for example, 388290 + ... + 393708.

It is an arithmetic number, because the mean of its divisors is an integer number (103500320).

Almost surely, 2^2118823581 is an apocalyptic number.

2118823581 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2118823581 is a deficient number, since it is larger than the sum of its proper divisors (1193186659).

2118823581 is a wasteful number, since it uses less digits than its factorization.

2118823581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5905.

The product of its digits is 30720, while the sum is 39.

The square root of 2118823581 is about 46030.6808661354. The cubic root of 2118823581 is about 1284.3939934487.

The spelling of 2118823581 in words is "two billion, one hundred eighteen million, eight hundred twenty-three thousand, five hundred eighty-one".