991763 has 8 divisors (see below), whose sum is σ = 1058832. Its totient is φ = 925696.

The previous prime is 991751. The next prime is 991777. The reversal of 991763 is 367199.

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

It is a cyclic number.

It is not a de Polignac number, because 991763 - 2¹⁴ = 975379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3731 + ... + 3987.

It is an arithmetic number, because the mean of its divisors is an integer number (132354).

2⁹⁹¹⁷⁶³ is an apocalyptic number.

991763 is a deficient number, since it is larger than the sum of its proper divisors (67069).

991763 is a wasteful number, since it uses less digits than its factorization.

991763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501.

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

The square root of 991763 is about 995.8729838689. The cubic root of 991763 is about 99.7246759959.

The spelling of 991763 in words is "nine hundred ninety-one thousand, seven hundred sixty-three".