4611721 has 4 divisors (see below), whose sum is σ = 4724244. Its totient is φ = 4499200.

The previous prime is 4611697. The next prime is 4611731. The reversal of 4611721 is 1271164.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2595321 + 2016400 = 1611^2 + 1420^2 .

It is a cyclic number.

It is not a de Polignac number, because 4611721 - 2⁹ = 4611209 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4611692 and 4611701.

It is not an unprimeable number, because it can be changed into a prime (4611731) 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, 56200 + ... + 56281.

It is an arithmetic number, because the mean of its divisors is an integer number (1181061).

Almost surely, 2^4611721 is an apocalyptic number.

4611721 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4611721 is a deficient number, since it is larger than the sum of its proper divisors (112523).

4611721 is a wasteful number, since it uses less digits than its factorization.

4611721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112522.

The product of its digits is 336, while the sum is 22.

The square root of 4611721 is about 2147.4917927666. The cubic root of 4611721 is about 166.4514854128.

Adding to 4611721 its reverse (1271164), we get a palindrome (5882885).

The spelling of 4611721 in words is "four million, six hundred eleven thousand, seven hundred twenty-one".