921193086 has 96 divisors (see below), whose sum is σ = 2126711808. Its totient is φ = 265716000.

The previous prime is 921193081. The next prime is 921193111. The reversal of 921193086 is 680391129.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921193081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15101496 + ... + 15101556.

It is an arithmetic number, because the mean of its divisors is an integer number (22153248).

Almost surely, 2^921193086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 921193086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1063355904).

921193086 is an abundant number, since it is smaller than the sum of its proper divisors (1205518722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

921193086 is a wasteful number, since it uses less digits than its factorization.

921193086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 921193086 is about 30351.1628442800. The cubic root of 921193086 is about 973.0090729095.

The spelling of 921193086 in words is "nine hundred twenty-one million, one hundred ninety-three thousand, eighty-six".