989199391 has 4 divisors (see below), whose sum is σ = 1012204072. Its totient is φ = 966194712.

The previous prime is 989199389. The next prime is 989199443. The reversal of 989199391 is 193991989.

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 989199391 - 2¹ = 989199389 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 (989199301) 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, 11502276 + ... + 11502361.

It is an arithmetic number, because the mean of its divisors is an integer number (253051018).

Almost surely, 2^989199391 is an apocalyptic number.

989199391 is a deficient number, since it is larger than the sum of its proper divisors (23004681).

989199391 is a wasteful number, since it uses less digits than its factorization.

989199391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23004680.

The product of its digits is 1417176, while the sum is 58.

The square root of 989199391 is about 31451.5403597344. The cubic root of 989199391 is about 996.3867572007.

The spelling of 989199391 in words is "nine hundred eighty-nine million, one hundred ninety-nine thousand, three hundred ninety-one".