991316 has 6 divisors (see below), whose sum is σ = 1734810. Its totient is φ = 495656.

The previous prime is 991313. The next prime is 991327. The reversal of 991316 is 613199.

It can be written as a sum of positive squares in only one way, i.e., 828100 + 163216 = 910^2 + 404^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991316.

It is not an unprimeable number, because it can be changed into a prime (991313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123911 + ... + 123918.

It is an arithmetic number, because the mean of its divisors is an integer number (289135).

2⁹⁹¹³¹⁶ is an apocalyptic number.

It is an amenable number.

991316 is a deficient number, since it is larger than the sum of its proper divisors (743494).

991316 is a wasteful number, since it uses less digits than its factorization.

991316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247833 (or 247831 counting only the distinct ones).

The product of its digits is 1458, while the sum is 29.

The square root of 991316 is about 995.6485323647. The cubic root of 991316 is about 99.7096913578.

The spelling of 991316 in words is "nine hundred ninety-one thousand, three hundred sixteen".