1216323713 has 16 divisors (see below), whose sum is σ = 1395178560. Its totient is φ = 1050100800.

The previous prime is 1216323679. The next prime is 1216323761. The reversal of 1216323713 is 3173236121.

It is a cyclic number.

It is not a de Polignac number, because 1216323713 - 2¹⁶ = 1216258177 is a prime.

It is a super-2 number, since 2×1216323713² = 2958886749612212738, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216323793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11795 + ... + 50712.

It is an arithmetic number, because the mean of its divisors is an integer number (87198660).

Almost surely, 2^1216323713 is an apocalyptic number.

It is an amenable number.

1216323713 is a deficient number, since it is larger than the sum of its proper divisors (178854847).

1216323713 is a wasteful number, since it uses less digits than its factorization.

1216323713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62608.

The product of its digits is 4536, while the sum is 29.

The square root of 1216323713 is about 34875.8327929241. The cubic root of 1216323713 is about 1067.4553655922.

Adding to 1216323713 its reverse (3173236121), we get a palindrome (4389559834).

The spelling of 1216323713 in words is "one billion, two hundred sixteen million, three hundred twenty-three thousand, seven hundred thirteen".