1216437609 has 8 divisors (see below), whose sum is σ = 1652519232. Its totient is φ = 795657200.

The previous prime is 1216437587. The next prime is 1216437643. The reversal of 1216437609 is 9067346121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1216437609 - 2⁸ = 1216437353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216437809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3825117 + ... + 3825434.

It is an arithmetic number, because the mean of its divisors is an integer number (206564904).

Almost surely, 2^1216437609 is an apocalyptic number.

It is an amenable number.

1216437609 is a deficient number, since it is larger than the sum of its proper divisors (436081623).

1216437609 is an equidigital number, since it uses as much as digits as its factorization.

1216437609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7650607.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 1216437609 is about 34877.4656332710. The cubic root of 1216437609 is about 1067.4886832308.

The spelling of 1216437609 in words is "one billion, two hundred sixteen million, four hundred thirty-seven thousand, six hundred nine".