1200116643 has 16 divisors (see below), whose sum is σ = 1762912512. Its totient is φ = 720140000.

The previous prime is 1200116639. The next prime is 1200116707. The reversal of 1200116643 is 3466110021.

It is a cyclic number.

It is not a de Polignac number, because 1200116643 - 2² = 1200116639 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1200116143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176703 + ... + 183368.

It is an arithmetic number, because the mean of its divisors is an integer number (110182032).

Almost surely, 2^1200116643 is an apocalyptic number.

1200116643 is a deficient number, since it is larger than the sum of its proper divisors (562795869).

1200116643 is a wasteful number, since it uses less digits than its factorization.

1200116643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360186.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1200116643 is about 34642.6997071533. The cubic root of 1200116643 is about 1062.6929990903.

Adding to 1200116643 its reverse (3466110021), we get a palindrome (4666226664).

The spelling of 1200116643 in words is "one billion, two hundred million, one hundred sixteen thousand, six hundred forty-three".