989191 has 8 divisors (see below), whose sum is σ = 1137024. Its totient is φ = 843000.

The previous prime is 989173. The next prime is 989231. The reversal of 989191 is 191989.

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 989191 - 2¹¹ = 987143 is a prime.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 989191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989171) 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, 1476 + ... + 2038.

It is an arithmetic number, because the mean of its divisors is an integer number (142128).

2⁹⁸⁹¹⁹¹ is an apocalyptic number.

989191 is a deficient number, since it is larger than the sum of its proper divisors (147833).

989191 is a wasteful number, since it uses less digits than its factorization.

989191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821.

The product of its digits is 5832, while the sum is 37.

The square root of 989191 is about 994.5808162236. The cubic root of 989191 is about 99.6383939870.

The spelling of 989191 in words is "nine hundred eighty-nine thousand, one hundred ninety-one".