991366 has 8 divisors (see below), whose sum is σ = 1496664. Its totient is φ = 492480.

The previous prime is 991357. The next prime is 991381. The reversal of 991366 is 663199.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1195 + ... + 1846.

It is an arithmetic number, because the mean of its divisors is an integer number (187083).

2⁹⁹¹³⁶⁶ is an apocalyptic number.

991366 is a deficient number, since it is larger than the sum of its proper divisors (505298).

991366 is a wasteful number, since it uses less digits than its factorization.

991366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3206.

The product of its digits is 8748, while the sum is 34.

The square root of 991366 is about 995.6736413102. The cubic root of 991366 is about 99.7113677156.

The spelling of 991366 in words is "nine hundred ninety-one thousand, three hundred sixty-six".