243645137 has 2 divisors, whose sum is σ = 243645138. Its totient is φ = 243645136.

The previous prime is 243645131. The next prime is 243645179. The reversal of 243645137 is 731546342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226472401 + 17172736 = 15049^2 + 4144^2 .

It is a cyclic number.

It is not a de Polignac number, because 243645137 - 2⁴ = 243645121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243645097 and 243645106.

It is not a weakly prime, because it can be changed into another prime (243645131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121822568 + 121822569.

It is an arithmetic number, because the mean of its divisors is an integer number (121822569).

Almost surely, 2^243645137 is an apocalyptic number.

It is an amenable number.

243645137 is a deficient number, since it is larger than the sum of its proper divisors (1).

243645137 is an equidigital number, since it uses as much as digits as its factorization.

243645137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 35.

The square root of 243645137 is about 15609.1363310082. The cubic root of 243645137 is about 624.5768972124.

The spelling of 243645137 in words is "two hundred forty-three million, six hundred forty-five thousand, one hundred thirty-seven".