1216043045 has 64 divisors (see below), whose sum is σ = 1783296000. Its totient is φ = 794787840.

The previous prime is 1216043021. The next prime is 1216043047. The reversal of 1216043045 is 5403406121.

It is not a de Polignac number, because 1216043045 - 2⁶ = 1216042981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216043047) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4731557 + ... + 4731813.

It is an arithmetic number, because the mean of its divisors is an integer number (27864000).

Almost surely, 2^1216043045 is an apocalyptic number.

It is an amenable number.

1216043045 is a deficient number, since it is larger than the sum of its proper divisors (567252955).

1216043045 is an equidigital number, since it uses as much as digits as its factorization.

1216043045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1216043045 is about 34871.8087428800. The cubic root of 1216043045 is about 1067.3732537863.

Adding to 1216043045 its reverse (5403406121), we get a palindrome (6619449166).

The spelling of 1216043045 in words is "one billion, two hundred sixteen million, forty-three thousand, forty-five".