1243113236 has 12 divisors (see below), whose sum is σ = 2303415828. Its totient is φ = 584994432.

The previous prime is 1243113173. The next prime is 1243113241. The reversal of 1243113236 is 6323113421.

It can be written as a sum of positive squares in 2 ways, for example, as 653109136 + 590004100 = 25556^2 + 24290^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9140471 + ... + 9140606.

It is an arithmetic number, because the mean of its divisors is an integer number (191951319).

Almost surely, 2^1243113236 is an apocalyptic number.

It is an amenable number.

1243113236 is a deficient number, since it is larger than the sum of its proper divisors (1060302592).

1243113236 is a wasteful number, since it uses less digits than its factorization.

1243113236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18281098 (or 18281096 counting only the distinct ones).

The product of its digits is 2592, while the sum is 26.

The square root of 1243113236 is about 35257.8109927432. The cubic root of 1243113236 is about 1075.2354230379.

Adding to 1243113236 its reverse (6323113421), we get a palindrome (7566226657).

The spelling of 1243113236 in words is "one billion, two hundred forty-three million, one hundred thirteen thousand, two hundred thirty-six".