4591221 has 16 divisors (see below), whose sum is σ = 6336960. Its totient is φ = 2954880.

The previous prime is 4591211. The next prime is 4591267. The reversal of 4591221 is 1221954.

It is not a de Polignac number, because 4591221 - 2¹¹ = 4589173 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 4591191 and 4591200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4591201) 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 15 ways as a sum of consecutive naturals, for example, 19935 + ... + 20163.

It is an arithmetic number, because the mean of its divisors is an integer number (396060).

Almost surely, 2^4591221 is an apocalyptic number.

4591221 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4591221 is a deficient number, since it is larger than the sum of its proper divisors (1745739).

4591221 is a wasteful number, since it uses less digits than its factorization.

4591221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436.

The product of its digits is 720, while the sum is 24.

The square root of 4591221 is about 2142.7134666119. The cubic root of 4591221 is about 166.2044826113.

The spelling of 4591221 in words is "four million, five hundred ninety-one thousand, two hundred twenty-one".