989883691 has 4 divisors (see below), whose sum is σ = 990230400. Its totient is φ = 989536984.

The previous prime is 989883673. The next prime is 989883733. The reversal of 989883691 is 196388989.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 989883691 - 2⁷ = 989883563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989881691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169036 + ... + 174793.

It is an arithmetic number, because the mean of its divisors is an integer number (247557600).

Almost surely, 2^989883691 is an apocalyptic number.

989883691 is a deficient number, since it is larger than the sum of its proper divisors (346709).

989883691 is a wasteful number, since it uses less digits than its factorization.

989883691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346708.

The product of its digits is 6718464, while the sum is 61.

The square root of 989883691 is about 31462.4171194776. The cubic root of 989883691 is about 996.6164615797.

The spelling of 989883691 in words is "nine hundred eighty-nine million, eight hundred eighty-three thousand, six hundred ninety-one".