1216630043 has 4 divisors (see below), whose sum is σ = 1216711368. Its totient is φ = 1216548720.

The previous prime is 1216630027. The next prime is 1216630049. The reversal of 1216630043 is 3400366121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1216630043 - 2⁴ = 1216630027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1216629994 and 1216630021.

It is not an unprimeable number, because it can be changed into a prime (1216630049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11018 + ... + 50543.

It is an arithmetic number, because the mean of its divisors is an integer number (304177842).

Almost surely, 2^1216630043 is an apocalyptic number.

1216630043 is a deficient number, since it is larger than the sum of its proper divisors (81325).

1216630043 is an equidigital number, since it uses as much as digits as its factorization.

1216630043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81324.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 1216630043 is about 34880.2242395315. The cubic root of 1216630043 is about 1067.5449706186.

Adding to 1216630043 its reverse (3400366121), we get a palindrome (4616996164).

The spelling of 1216630043 in words is "one billion, two hundred sixteen million, six hundred thirty thousand, forty-three".