1216871847 has 12 divisors (see below), whose sum is σ = 1758006120. Its totient is φ = 811108368.

The previous prime is 1216871779. The next prime is 1216871857. The reversal of 1216871847 is 7481786121.

It is not a de Polignac number, because 1216871847 - 2¹¹ = 1216869799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216871857) 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, 98373 + ... + 110049.

It is an arithmetic number, because the mean of its divisors is an integer number (146500510).

Almost surely, 2^1216871847 is an apocalyptic number.

1216871847 is a deficient number, since it is larger than the sum of its proper divisors (541134273).

1216871847 is a wasteful number, since it uses less digits than its factorization.

1216871847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23262 (or 23259 counting only the distinct ones).

The product of its digits is 150528, while the sum is 45.

The square root of 1216871847 is about 34883.6902721028. The cubic root of 1216871847 is about 1067.6156904308.

The spelling of 1216871847 in words is "one billion, two hundred sixteen million, eight hundred seventy-one thousand, eight hundred forty-seven".