991782359 has 4 divisors (see below), whose sum is σ = 992544816. Its totient is φ = 991019904.

The previous prime is 991782343. The next prime is 991782361. The reversal of 991782359 is 953287199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 953287199 = 61 ⋅15627659.

It is a cyclic number.

It is not a de Polignac number, because 991782359 - 2⁴ = 991782343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 991782359.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991782859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379274 + ... + 381879.

It is an arithmetic number, because the mean of its divisors is an integer number (248136204).

Almost surely, 2^991782359 is an apocalyptic number.

991782359 is a deficient number, since it is larger than the sum of its proper divisors (762457).

991782359 is a wasteful number, since it uses less digits than its factorization.

991782359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762456.

The product of its digits is 1224720, while the sum is 53.

The square root of 991782359 is about 31492.5762521900. The cubic root of 991782359 is about 997.2532485978.

The spelling of 991782359 in words is "nine hundred ninety-one million, seven hundred eighty-two thousand, three hundred fifty-nine".