4991323 has 4 divisors (see below), whose sum is σ = 5035608. Its totient is φ = 4947040.

The previous prime is 4991317. The next prime is 4991333. The reversal of 4991323 is 3231994.

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 4991323 - 2⁵ = 4991291 is a prime.

It is a Duffinian number.

4991323 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4991303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21973 + ... + 22198.

It is an arithmetic number, because the mean of its divisors is an integer number (1258902).

Almost surely, 2^4991323 is an apocalyptic number.

4991323 is a deficient number, since it is larger than the sum of its proper divisors (44285).

4991323 is a wasteful number, since it uses less digits than its factorization.

4991323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44284.

The product of its digits is 5832, while the sum is 31.

The square root of 4991323 is about 2234.1268988130. The cubic root of 4991323 is about 170.8986209840.

The spelling of 4991323 in words is "four million, nine hundred ninety-one thousand, three hundred twenty-three".