2181343231 has 2 divisors, whose sum is σ = 2181343232. Its totient is φ = 2181343230.

The previous prime is 2181343193. The next prime is 2181343249. The reversal of 2181343231 is 1323431812.

2181343231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2181343231 - 2¹⁹ = 2180818943 is a prime.

It is a super-2 number, since 2×2181343231² = 9516516582859038722, 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 2181343231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2181343261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090671615 + 1090671616.

It is an arithmetic number, because the mean of its divisors is an integer number (1090671616).

Almost surely, 2^2181343231 is an apocalyptic number.

2181343231 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181343231 is an equidigital number, since it uses as much as digits as its factorization.

2181343231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 2181343231 is about 46704.8523282110. The cubic root of 2181343231 is about 1296.9045149414.

The spelling of 2181343231 in words is "two billion, one hundred eighty-one million, three hundred forty-three thousand, two hundred thirty-one".