4581991 has 8 divisors (see below), whose sum is σ = 4848480. Its totient is φ = 4321152.

The previous prime is 4581977. The next prime is 4582049. The reversal of 4581991 is 1991854.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4581991 is a prime.

It is a Duffinian number.

4581991 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 4581991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4581911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315 + ... + 3043.

It is an arithmetic number, because the mean of its divisors is an integer number (606060).

Almost surely, 2^4581991 is an apocalyptic number.

4581991 is a deficient number, since it is larger than the sum of its proper divisors (266489).

4581991 is a wasteful number, since it uses less digits than its factorization.

4581991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2825.

The product of its digits is 12960, while the sum is 37.

The square root of 4581991 is about 2140.5585719620. The cubic root of 4581991 is about 166.0930310292.

The spelling of 4581991 in words is "four million, five hundred eighty-one thousand, nine hundred ninety-one".