2218312831 has 32 divisors (see below), whose sum is σ = 2658757248. Its totient is φ = 1811496960.

The previous prime is 2218312801. The next prime is 2218312843. The reversal of 2218312831 is 1382138122.

It is not a de Polignac number, because 2218312831 - 2⁵ = 2218312799 is a prime.

It is a super-2 number, since 2×2218312831² = 9841823632358469122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2218312793 and 2218312802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218312801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2366995 + ... + 2367931.

It is an arithmetic number, because the mean of its divisors is an integer number (83086164).

Almost surely, 2^2218312831 is an apocalyptic number.

2218312831 is a deficient number, since it is larger than the sum of its proper divisors (440444417).

2218312831 is a wasteful number, since it uses less digits than its factorization.

2218312831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171.

The product of its digits is 4608, while the sum is 31.

The square root of 2218312831 is about 47098.9684706576. The cubic root of 2218312831 is about 1304.1901937490.

The spelling of 2218312831 in words is "two billion, two hundred eighteen million, three hundred twelve thousand, eight hundred thirty-one".