243431137 has 2 divisors, whose sum is σ = 243431138. Its totient is φ = 243431136.

The previous prime is 243431113. The next prime is 243431141. The reversal of 243431137 is 731134342.

243431137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215032896 + 28398241 = 14664^2 + 5329^2 .

It is a cyclic number.

It is not a de Polignac number, because 243431137 - 2⁷ = 243431009 is a prime.

It is a super-2 number, since 2×243431137² = 118517436922225538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243437137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121715568 + 121715569.

It is an arithmetic number, because the mean of its divisors is an integer number (121715569).

Almost surely, 2^243431137 is an apocalyptic number.

It is an amenable number.

243431137 is a deficient number, since it is larger than the sum of its proper divisors (1).

243431137 is an equidigital number, since it uses as much as digits as its factorization.

243431137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 28.

The square root of 243431137 is about 15602.2798654556. The cubic root of 243431137 is about 624.3939828190.

Adding to 243431137 its reverse (731134342), we get a palindrome (974565479).

The spelling of 243431137 in words is "two hundred forty-three million, four hundred thirty-one thousand, one hundred thirty-seven".