991306 has 12 divisors (see below), whose sum is σ = 1570482. Its totient is φ = 469224.

The previous prime is 991273. The next prime is 991313. The reversal of 991306 is 603199.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 549081 + 442225 = 741^2 + 665^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36 + ... + 1408.

2⁹⁹¹³⁰⁶ is an apocalyptic number.

991306 is a deficient number, since it is larger than the sum of its proper divisors (579176).

991306 is a wasteful number, since it uses less digits than its factorization.

991306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413 (or 1394 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 991306 is about 995.6435104996. The cubic root of 991306 is about 99.7093560795.

The spelling of 991306 in words is "nine hundred ninety-one thousand, three hundred six".