2181344237 has 2 divisors, whose sum is σ = 2181344238. Its totient is φ = 2181344236.

The previous prime is 2181344183. The next prime is 2181344251. The reversal of 2181344237 is 7324431812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1931514601 + 249829636 = 43949^2 + 15806^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181344237 - 2²⁴ = 2164567021 is a prime.

It is a super-2 number, since 2×2181344237² = 9516525360586224338, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2181344197 and 2181344206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2181344437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090672118 + 1090672119.

It is an arithmetic number, because the mean of its divisors is an integer number (1090672119).

Almost surely, 2^2181344237 is an apocalyptic number.

It is an amenable number.

2181344237 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181344237 is an equidigital number, since it uses as much as digits as its factorization.

2181344237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 35.

The square root of 2181344237 is about 46704.8630979687. The cubic root of 2181344237 is about 1296.9047143118.

The spelling of 2181344237 in words is "two billion, one hundred eighty-one million, three hundred forty-four thousand, two hundred thirty-seven".