243983137 has 2 divisors, whose sum is σ = 243983138. Its totient is φ = 243983136.

The previous prime is 243983081. The next prime is 243983213. The reversal of 243983137 is 731389342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242238096 + 1745041 = 15564^2 + 1321^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243983137 is a prime.

It is a super-2 number, since 2×243983137² = 119055542280721538, 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 243983137.

It is not a weakly prime, because it can be changed into another prime (243984137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121991568 + 121991569.

It is an arithmetic number, because the mean of its divisors is an integer number (121991569).

Almost surely, 2^243983137 is an apocalyptic number.

It is an amenable number.

243983137 is a deficient number, since it is larger than the sum of its proper divisors (1).

243983137 is an equidigital number, since it uses as much as digits as its factorization.

243983137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 40.

The square root of 243983137 is about 15619.9595710104. The cubic root of 243983137 is about 624.8655813327.

The spelling of 243983137 in words is "two hundred forty-three million, nine hundred eighty-three thousand, one hundred thirty-seven".