243020137 has 2 divisors, whose sum is σ = 243020138. Its totient is φ = 243020136.

The previous prime is 243020119. The next prime is 243020147. The reversal of 243020137 is 731020342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239135296 + 3884841 = 15464^2 + 1971^2 .

It is a cyclic number.

It is not a de Polignac number, because 243020137 - 2⁷ = 243020009 is a prime.

It is not a weakly prime, because it can be changed into another prime (243020147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121510068 + 121510069.

It is an arithmetic number, because the mean of its divisors is an integer number (121510069).

Almost surely, 2^243020137 is an apocalyptic number.

It is an amenable number.

243020137 is a deficient number, since it is larger than the sum of its proper divisors (1).

243020137 is an equidigital number, since it uses as much as digits as its factorization.

243020137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 243020137 is about 15589.1031493156. The cubic root of 243020137 is about 624.0423837431.

Adding to 243020137 its reverse (731020342), we get a palindrome (974040479).

The spelling of 243020137 in words is "two hundred forty-three million, twenty thousand, one hundred thirty-seven".