1216158017 has 4 divisors (see below), whose sum is σ = 1227315540. Its totient is φ = 1205000496.

The previous prime is 1216157989. The next prime is 1216158049. The reversal of 1216158017 is 7108516121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 673454401 + 542703616 = 25951^2 + 23296^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216158017 - 2¹⁶ = 1216092481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216158067) 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 3 ways as a sum of consecutive naturals, for example, 5578598 + ... + 5578815.

It is an arithmetic number, because the mean of its divisors is an integer number (306828885).

Almost surely, 2^1216158017 is an apocalyptic number.

It is an amenable number.

1216158017 is a deficient number, since it is larger than the sum of its proper divisors (11157523).

1216158017 is a wasteful number, since it uses less digits than its factorization.

1216158017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11157522.

The product of its (nonzero) digits is 3360, while the sum is 32.

The square root of 1216158017 is about 34873.4571988497. The cubic root of 1216158017 is about 1067.4068913485.

The spelling of 1216158017 in words is "one billion, two hundred sixteen million, one hundred fifty-eight thousand, seventeen".