1216334999 has 8 divisors (see below), whose sum is σ = 1327253520. Its totient is φ = 1105473600.

The previous prime is 1216334993. The next prime is 1216335011. The reversal of 1216334999 is 9994336121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1216334999 - 2²⁸ = 947899543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216334993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38867 + ... + 62795.

It is an arithmetic number, because the mean of its divisors is an integer number (165906690).

Almost surely, 2^1216334999 is an apocalyptic number.

1216334999 is a deficient number, since it is larger than the sum of its proper divisors (110918521).

1216334999 is a wasteful number, since it uses less digits than its factorization.

1216334999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28561.

The product of its digits is 314928, while the sum is 47.

The square root of 1216334999 is about 34875.9945951366. The cubic root of 1216334999 is about 1067.4586671431.

The spelling of 1216334999 in words is "one billion, two hundred sixteen million, three hundred thirty-four thousand, nine hundred ninety-nine".