4311721 has 4 divisors (see below), whose sum is σ = 4428292. Its totient is φ = 4195152.

The previous prime is 4311701. The next prime is 4311743. The reversal of 4311721 is 1271134.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1271134 = 2 ⋅635567.

It can be written as a sum of positive squares in 2 ways, for example, as 3474496 + 837225 = 1864^2 + 915^2 .

It is a cyclic number.

It is not a de Polignac number, because 4311721 - 2¹¹ = 4309673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4311701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58230 + ... + 58303.

It is an arithmetic number, because the mean of its divisors is an integer number (1107073).

Almost surely, 2^4311721 is an apocalyptic number.

It is an amenable number.

4311721 is a deficient number, since it is larger than the sum of its proper divisors (116571).

4311721 is a wasteful number, since it uses less digits than its factorization.

4311721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116570.

The product of its digits is 168, while the sum is 19.

The square root of 4311721 is about 2076.4683960995. The cubic root of 4311721 is about 162.7609503542.

Adding to 4311721 its reverse (1271134), we get a palindrome (5582855).

The spelling of 4311721 in words is "four million, three hundred eleven thousand, seven hundred twenty-one".