991713 has 8 divisors (see below), whose sum is σ = 1368000. Its totient is φ = 638288.

The previous prime is 991703. The next prime is 991717. The reversal of 991713 is 317199.

991713 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 991713 - 2⁹ = 991201 is a prime.

It is a super-3 number, since 3×991713³ = 2926033362007512291, which contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (991717) 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, 5613 + ... + 5786.

It is an arithmetic number, because the mean of its divisors is an integer number (171000).

2⁹⁹¹⁷¹³ is an apocalyptic number.

It is an amenable number.

991713 is a deficient number, since it is larger than the sum of its proper divisors (376287).

991713 is a wasteful number, since it uses less digits than its factorization.

991713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11431.

The product of its digits is 1701, while the sum is 30.

The square root of 991713 is about 995.8478799495. The cubic root of 991713 is about 99.7230000856.

The spelling of 991713 in words is "nine hundred ninety-one thousand, seven hundred thirteen".