991903327 has 4 divisors (see below), whose sum is σ = 1026106920. Its totient is φ = 957699736.

The previous prime is 991903307. The next prime is 991903333. The reversal of 991903327 is 723309199.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 991903327 - 2¹¹ = 991901279 is a prime.

It is a super-2 number, since 2×991903327² = 1967744420227337858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991903307) 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, 17101753 + ... + 17101810.

It is an arithmetic number, because the mean of its divisors is an integer number (256526730).

Almost surely, 2^991903327 is an apocalyptic number.

991903327 is a deficient number, since it is larger than the sum of its proper divisors (34203593).

991903327 is a wasteful number, since it uses less digits than its factorization.

991903327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34203592.

The product of its (nonzero) digits is 91854, while the sum is 43.

The square root of 991903327 is about 31494.4967732460. The cubic root of 991903327 is about 997.2937920449.

The spelling of 991903327 in words is "nine hundred ninety-one million, nine hundred three thousand, three hundred twenty-seven".