1243343137 has 2 divisors, whose sum is σ = 1243343138. Its totient is φ = 1243343136.

The previous prime is 1243343107. The next prime is 1243343191. The reversal of 1243343137 is 7313433421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1204853521 + 38489616 = 34711^2 + 6204^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243343137 - 2¹¹ = 1243341089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1243343099 and 1243343108.

It is not a weakly prime, because it can be changed into another prime (1243343107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621671568 + 621671569.

It is an arithmetic number, because the mean of its divisors is an integer number (621671569).

Almost surely, 2^1243343137 is an apocalyptic number.

It is an amenable number.

1243343137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243343137 is an equidigital number, since it uses as much as digits as its factorization.

1243343137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 31.

The square root of 1243343137 is about 35261.0711266689. The cubic root of 1243343137 is about 1075.3017035275.

Adding to 1243343137 its reverse (7313433421), we get a palindrome (8556776558).

The spelling of 1243343137 in words is "one billion, two hundred forty-three million, three hundred forty-three thousand, one hundred thirty-seven".