4491643 has 4 divisors (see below), whose sum is σ = 4837168. Its totient is φ = 4146120.

The previous prime is 4491631. The next prime is 4491653. The reversal of 4491643 is 3461944.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4491643 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4491623) 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 3 ways as a sum of consecutive naturals, for example, 172743 + ... + 172768.

It is an arithmetic number, because the mean of its divisors is an integer number (1209292).

Almost surely, 2^4491643 is an apocalyptic number.

4491643 is a deficient number, since it is larger than the sum of its proper divisors (345525).

4491643 is a wasteful number, since it uses less digits than its factorization.

4491643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345524.

The product of its digits is 10368, while the sum is 31.

The square root of 4491643 is about 2119.3496644018. The cubic root of 4491643 is about 164.9940983503.

The spelling of 4491643 in words is "four million, four hundred ninety-one thousand, six hundred forty-three".