1216304001 has 12 divisors (see below), whose sum is σ = 1916600400. Its totient is φ = 737153880.

The previous prime is 1216303951. The next prime is 1216304021. The reversal of 1216304001 is 1004036121.

It is a happy number.

It is not a de Polignac number, because 1216304001 - 2⁶ = 1216303937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216304021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6142851 + ... + 6143048.

It is an arithmetic number, because the mean of its divisors is an integer number (159716700).

Almost surely, 2^1216304001 is an apocalyptic number.

1216304001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1216304001 is a deficient number, since it is larger than the sum of its proper divisors (700296399).

1216304001 is a wasteful number, since it uses less digits than its factorization.

1216304001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12285916 (or 12285913 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1216304001 is about 34875.5501892085. The cubic root of 1216304001 is about 1067.4495990917.

The spelling of 1216304001 in words is "one billion, two hundred sixteen million, three hundred four thousand, one".