991367 has 4 divisors (see below), whose sum is σ = 1067640. Its totient is φ = 915096.

The previous prime is 991357. The next prime is 991381. The reversal of 991367 is 763199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 763199 = 37 ⋅20627.

It is not a de Polignac number, because 991367 - 2¹⁴ = 974983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38117 + ... + 38142.

It is an arithmetic number, because the mean of its divisors is an integer number (266910).

2⁹⁹¹³⁶⁷ is an apocalyptic number.

991367 is a deficient number, since it is larger than the sum of its proper divisors (76273).

991367 is a wasteful number, since it uses less digits than its factorization.

991367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76272.

The product of its digits is 10206, while the sum is 35.

The square root of 991367 is about 995.6741434827. The cubic root of 991367 is about 99.7114012421.

The spelling of 991367 in words is "nine hundred ninety-one thousand, three hundred sixty-seven".