1216386589 has 8 divisors (see below), whose sum is σ = 1327576320. Its totient is φ = 1105298400.

The previous prime is 1216386557. The next prime is 1216386607. The reversal of 1216386589 is 9856836121.

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

It is a cyclic number.

It is not a de Polignac number, because 1216386589 - 2⁵ = 1216386557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216386529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 852 + ... + 49330.

It is an arithmetic number, because the mean of its divisors is an integer number (165947040).

Almost surely, 2^1216386589 is an apocalyptic number.

It is an amenable number.

1216386589 is a deficient number, since it is larger than the sum of its proper divisors (111189731).

1216386589 is a wasteful number, since it uses less digits than its factorization.

1216386589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50771.

The product of its digits is 622080, while the sum is 49.

The square root of 1216386589 is about 34876.7342077781. The cubic root of 1216386589 is about 1067.4737587679.

The spelling of 1216386589 in words is "one billion, two hundred sixteen million, three hundred eighty-six thousand, five hundred eighty-nine".