1991682216 has 32 divisors (see below), whose sum is σ = 5532451200. Its totient is φ = 663894000.

The previous prime is 1991682191. The next prime is 1991682227. The reversal of 1991682216 is 6122861991.

It is a nude number because it is divisible by every one of its digits.

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, 4610160 + ... + 4610591.

It is an arithmetic number, because the mean of its divisors is an integer number (172889100).

Almost surely, 2^1991682216 is an apocalyptic number.

It is an amenable number.

1991682216 is an abundant number, since it is smaller than the sum of its proper divisors (3540768984).

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

1991682216 is a wasteful number, since it uses less digits than its factorization.

1991682216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9220766 (or 9220756 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 1991682216 is about 44628.2670064613. The cubic root of 1991682216 is about 1258.1719977513.

The spelling of 1991682216 in words is "one billion, nine hundred ninety-one million, six hundred eighty-two thousand, two hundred sixteen".