1216003611 has 8 divisors (see below), whose sum is σ = 1677246480. Its totient is φ = 782714912.

The previous prime is 1216003609. The next prime is 1216003639. The reversal of 1216003611 is 1163006121.

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

It is a cyclic number.

It is not a de Polignac number, because 1216003611 - 2¹ = 1216003609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216003661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6988440 + ... + 6988613.

It is an arithmetic number, because the mean of its divisors is an integer number (209655810).

Almost surely, 2^1216003611 is an apocalyptic number.

1216003611 is a deficient number, since it is larger than the sum of its proper divisors (461242869).

1216003611 is a wasteful number, since it uses less digits than its factorization.

1216003611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13977085.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1216003611 is about 34871.2433245504. The cubic root of 1216003611 is about 1067.3617160226.

Adding to 1216003611 its reverse (1163006121), we get a palindrome (2379009732).

The spelling of 1216003611 in words is "one billion, two hundred sixteen million, three thousand, six hundred eleven".