991059 has 8 divisors (see below), whose sum is σ = 1391040. Its totient is φ = 625896.

The previous prime is 991057. The next prime is 991063. The reversal of 991059 is 950199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 991059 - 2¹ = 991057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (991057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8637 + ... + 8750.

It is an arithmetic number, because the mean of its divisors is an integer number (173880).

2⁹⁹¹⁰⁵⁹ is an apocalyptic number.

991059 is a deficient number, since it is larger than the sum of its proper divisors (399981).

991059 is a wasteful number, since it uses less digits than its factorization.

991059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17409.

The product of its (nonzero) digits is 3645, while the sum is 33.

The square root of 991059 is about 995.5194623914. The cubic root of 991059 is about 99.7010739894.

The spelling of 991059 in words is "nine hundred ninety-one thousand, fifty-nine".