916686221 has 8 divisors (see below), whose sum is σ = 1000259904. Its totient is φ = 833152320.

The previous prime is 916686203. The next prime is 916686233. The reversal of 916686221 is 122686619.

It is a happy number.

916686221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 916686221 - 2¹⁰ = 916685197 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 (916686271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59141 + ... + 73013.

It is an arithmetic number, because the mean of its divisors is an integer number (125032488).

Almost surely, 2^916686221 is an apocalyptic number.

It is an amenable number.

916686221 is a deficient number, since it is larger than the sum of its proper divisors (83573683).

916686221 is a wasteful number, since it uses less digits than its factorization.

916686221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19891.

The product of its digits is 62208, while the sum is 41.

The square root of 916686221 is about 30276.8264684395. The cubic root of 916686221 is about 971.4196878853.

The spelling of 916686221 in words is "nine hundred sixteen million, six hundred eighty-six thousand, two hundred twenty-one".