1216541043 has 48 divisors (see below), whose sum is σ = 1829667840. Its totient is φ = 778548672.

The previous prime is 1216541009. The next prime is 1216541057. The reversal of 1216541043 is 3401456121.

It is a happy number.

1216541043 is a `hidden beast` number, since 1 + 2 + 1 + 654 + 1 + 0 + 4 + 3 = 666.

It is not a de Polignac number, because 1216541043 - 2⁶ = 1216540979 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1216540998 and 1216541016.

It is not an unprimeable number, because it can be changed into a prime (1216541003) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5455230 + ... + 5455452.

It is an arithmetic number, because the mean of its divisors is an integer number (38118080).

Almost surely, 2^1216541043 is an apocalyptic number.

1216541043 is a deficient number, since it is larger than the sum of its proper divisors (613126797).

1216541043 is a wasteful number, since it uses less digits than its factorization.

1216541043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488 (or 485 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1216541043 is about 34878.9484216483. The cubic root of 1216541043 is about 1067.5189386516.

Adding to 1216541043 its reverse (3401456121), we get a palindrome (4617997164).

The spelling of 1216541043 in words is "one billion, two hundred sixteen million, five hundred forty-one thousand, forty-three".