4518991 has 8 divisors (see below), whose sum is σ = 4809024. Its totient is φ = 4231680.

The previous prime is 4518989. The next prime is 4519007. The reversal of 4518991 is 1998154.

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

It is a cyclic number.

It is not a de Polignac number, because 4518991 - 2¹ = 4518989 is a prime.

It is a Duffinian number.

4518991 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 4518991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4518191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3546 + ... + 4648.

It is an arithmetic number, because the mean of its divisors is an integer number (601128).

Almost surely, 2^4518991 is an apocalyptic number.

4518991 is a deficient number, since it is larger than the sum of its proper divisors (290033).

4518991 is a wasteful number, since it uses less digits than its factorization.

4518991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361.

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

The square root of 4518991 is about 2125.7918524635. The cubic root of 4518991 is about 165.3282842754.

The spelling of 4518991 in words is "four million, five hundred eighteen thousand, nine hundred ninety-one".