991315 has 16 divisors (see below), whose sum is σ = 1302336. Its totient is φ = 720000.

The previous prime is 991313. The next prime is 991327. The reversal of 991315 is 513199.

It is not a de Polignac number, because 991315 - 2¹ = 991313 is a prime.

It is a Duffinian number.

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 in 15 ways as a sum of consecutive naturals, for example, 6490 + ... + 6640.

It is an arithmetic number, because the mean of its divisors is an integer number (81396).

2⁹⁹¹³¹⁵ is an apocalyptic number.

991315 is a deficient number, since it is larger than the sum of its proper divisors (311021).

991315 is a wasteful number, since it uses less digits than its factorization.

991315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270.

The product of its digits is 1215, while the sum is 28.

The square root of 991315 is about 995.6480301793. The cubic root of 991315 is about 99.7096578301.

The spelling of 991315 in words is "nine hundred ninety-one thousand, three hundred fifteen".