1216199273 has 16 divisors (see below), whose sum is σ = 1264710720. Its totient is φ = 1168862400.

The previous prime is 1216199263. The next prime is 1216199297. The reversal of 1216199273 is 3729916121.

It is a cyclic number.

It is not a de Polignac number, because 1216199273 - 2²⁶ = 1149090409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1216199273.

It is not an unprimeable number, because it can be changed into a prime (1216199203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 650486 + ... + 652352.

It is an arithmetic number, because the mean of its divisors is an integer number (79044420).

Almost surely, 2^1216199273 is an apocalyptic number.

It is an amenable number.

1216199273 is a deficient number, since it is larger than the sum of its proper divisors (48511447).

1216199273 is a wasteful number, since it uses less digits than its factorization.

1216199273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2168.

The product of its digits is 40824, while the sum is 41.

The square root of 1216199273 is about 34874.0487038715. The cubic root of 1216199273 is about 1067.4189611728.

The spelling of 1216199273 in words is "one billion, two hundred sixteen million, one hundred ninety-nine thousand, two hundred seventy-three".