1216100685 has 8 divisors (see below), whose sum is σ = 1945761120. Its totient is φ = 648587024.

The previous prime is 1216100671. The next prime is 1216100693. The reversal of 1216100685 is 5860016121.

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 1216100685 - 2¹⁴ = 1216084301 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40536675 + ... + 40536704.

It is an arithmetic number, because the mean of its divisors is an integer number (243220140).

Almost surely, 2^1216100685 is an apocalyptic number.

1216100685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216100685 is a deficient number, since it is larger than the sum of its proper divisors (729660435).

1216100685 is an equidigital number, since it uses as much as digits as its factorization.

1216100685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81073387.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 1216100685 is about 34872.6351886404. The cubic root of 1216100685 is about 1067.3901178885.

The spelling of 1216100685 in words is "one billion, two hundred sixteen million, one hundred thousand, six hundred eighty-five".