1216197243 has 12 divisors (see below), whose sum is σ = 1833109200. Its totient is φ = 775545936.

The previous prime is 1216197223. The next prime is 1216197247. The reversal of 1216197243 is 3427916121.

1216197243 is a `hidden beast` number, since 12 + 1 + 619 + 7 + 24 + 3 = 666.

It is not a de Polignac number, because 1216197243 - 2⁵ = 1216197211 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1216197198 and 1216197207.

It is not an unprimeable number, because it can be changed into a prime (1216197247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2937468 + ... + 2937881.

It is an arithmetic number, because the mean of its divisors is an integer number (152759100).

Almost surely, 2^1216197243 is an apocalyptic number.

1216197243 is a deficient number, since it is larger than the sum of its proper divisors (616911957).

1216197243 is a wasteful number, since it uses less digits than its factorization.

1216197243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5875378 (or 5875375 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 1216197243 is about 34874.0195991228. The cubic root of 1216197243 is about 1067.4183672839.

The spelling of 1216197243 in words is "one billion, two hundred sixteen million, one hundred ninety-seven thousand, two hundred forty-three".