4991091 has 24 divisors (see below), whose sum is σ = 8153280. Its totient is φ = 2700432.

The previous prime is 4991033. The next prime is 4991101. The reversal of 4991091 is 1901994.

It is not a de Polignac number, because 4991091 - 2¹⁰ = 4990067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4991011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1900 + ... + 3686.

It is an arithmetic number, because the mean of its divisors is an integer number (339720).

Almost surely, 2^4991091 is an apocalyptic number.

4991091 is a deficient number, since it is larger than the sum of its proper divisors (3162189).

4991091 is a wasteful number, since it uses less digits than its factorization.

4991091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1823 (or 1816 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 4991091 is about 2234.0749763605. The cubic root of 4991091 is about 170.8959731159.

The spelling of 4991091 in words is "four million, nine hundred ninety-one thousand, ninety-one".