1216707073 has 4 divisors (see below), whose sum is σ = 1216784320. Its totient is φ = 1216629828.

The previous prime is 1216707029. The next prime is 1216707077. The reversal of 1216707073 is 3707076121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216707073 is a prime.

It is a super-2 number, since 2×1216707073² = 2960752202976454658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216707077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5565 + ... + 49642.

It is an arithmetic number, because the mean of its divisors is an integer number (304196080).

Almost surely, 2^1216707073 is an apocalyptic number.

It is an amenable number.

1216707073 is a deficient number, since it is larger than the sum of its proper divisors (77247).

1216707073 is an equidigital number, since it uses as much as digits as its factorization.

1216707073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77246.

The product of its (nonzero) digits is 12348, while the sum is 34.

The square root of 1216707073 is about 34881.3284294047. The cubic root of 1216707073 is about 1067.5675004073.

The spelling of 1216707073 in words is "one billion, two hundred sixteen million, seven hundred seven thousand, seventy-three".