4991331 has 4 divisors (see below), whose sum is σ = 6655112. Its totient is φ = 3327552.

The previous prime is 4991317. The next prime is 4991333. The reversal of 4991331 is 1331994.

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

It is not a de Polignac number, because 4991331 - 2⁶ = 4991267 is a prime.

It is a super-2 number, since 2×4991331² = 49826770303122, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4991333) 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, 831886 + ... + 831891.

It is an arithmetic number, because the mean of its divisors is an integer number (1663778).

Almost surely, 2^4991331 is an apocalyptic number.

4991331 is a deficient number, since it is larger than the sum of its proper divisors (1663781).

4991331 is a wasteful number, since it uses less digits than its factorization.

4991331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663780.

The product of its digits is 2916, while the sum is 30.

The square root of 4991331 is about 2234.1286892209. The cubic root of 4991331 is about 170.8987122883.

It can be divided in two parts, 499 and 1331, that added together give a triangular number (1830 = T₆₀).

The spelling of 4991331 in words is "four million, nine hundred ninety-one thousand, three hundred thirty-one".