243423637 has 2 divisors, whose sum is σ = 243423638. Its totient is φ = 243423636.

The previous prime is 243423619. The next prime is 243423667. The reversal of 243423637 is 736324342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184579396 + 58844241 = 13586^2 + 7671^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243423637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243423667) 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, 121711818 + 121711819.

It is an arithmetic number, because the mean of its divisors is an integer number (121711819).

Almost surely, 2^243423637 is an apocalyptic number.

It is an amenable number.

243423637 is a deficient number, since it is larger than the sum of its proper divisors (1).

243423637 is an equidigital number, since it uses as much as digits as its factorization.

243423637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 34.

The square root of 243423637 is about 15602.0395141148. The cubic root of 243423637 is about 624.3875703238.

Adding to 243423637 its reverse (736324342), we get a palindrome (979747979).

The spelling of 243423637 in words is "two hundred forty-three million, four hundred twenty-three thousand, six hundred thirty-seven".