1216636067 has 4 divisors (see below), whose sum is σ = 1216950120. Its totient is φ = 1216322016.

The previous prime is 1216636061. The next prime is 1216636073. The reversal of 1216636067 is 7606366121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7606366121 = 19 ⋅400335059.

It is an interprime number because it is at equal distance from previous prime (1216636061) and next prime (1216636073).

It is a cyclic number.

It is not a de Polignac number, because 1216636067 - 2²⁴ = 1199858851 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 1216636067.

It is not an unprimeable number, because it can be changed into a prime (1216636061) 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, 151142 + ... + 158987.

It is an arithmetic number, because the mean of its divisors is an integer number (304237530).

Almost surely, 2^1216636067 is an apocalyptic number.

1216636067 is a deficient number, since it is larger than the sum of its proper divisors (314053).

1216636067 is an equidigital number, since it uses as much as digits as its factorization.

1216636067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314052.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 1216636067 is about 34880.3105920805. The cubic root of 1216636067 is about 1067.5467325566.

The spelling of 1216636067 in words is "one billion, two hundred sixteen million, six hundred thirty-six thousand, sixty-seven".