4991071 has 8 divisors (see below), whose sum is σ = 5151744. Its totient is φ = 4832760.

The previous prime is 4991033. The next prime is 4991101. The reversal of 4991071 is 1701994.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4991071 - 2¹⁷ = 4859999 is a prime.

It is an Ulam number.

It is a Duffinian number.

4991071 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4991011) 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 7 ways as a sum of consecutive naturals, for example, 4326 + ... + 5356.

It is an arithmetic number, because the mean of its divisors is an integer number (643968).

Almost surely, 2^4991071 is an apocalyptic number.

4991071 is a deficient number, since it is larger than the sum of its proper divisors (160673).

4991071 is a wasteful number, since it uses less digits than its factorization.

4991071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 4991071 is about 2234.0705002305. The cubic root of 4991071 is about 170.8957448476.

The spelling of 4991071 in words is "four million, nine hundred ninety-one thousand, seventy-one".