5311721 has 4 divisors (see below), whose sum is σ = 5317200. Its totient is φ = 5306244.

The previous prime is 5311703. The next prime is 5311739. The reversal of 5311721 is 1271135.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (5311703) and next prime (5311739).

It is a cyclic number.

It is not a de Polignac number, because 5311721 - 2¹⁴ = 5295337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 5311693 and 5311702.

It is not an unprimeable number, because it can be changed into a prime (5311771) 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, 851 + ... + 3368.

It is an arithmetic number, because the mean of its divisors is an integer number (1329300).

Almost surely, 2^5311721 is an apocalyptic number.

It is an amenable number.

5311721 is a deficient number, since it is larger than the sum of its proper divisors (5479).

5311721 is a wasteful number, since it uses less digits than its factorization.

5311721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5478.

The product of its digits is 210, while the sum is 20.

The square root of 5311721 is about 2304.7171193012. The cubic root of 5311721 is about 174.4797720414.

Adding to 5311721 its reverse (1271135), we get a palindrome (6582856).

The spelling of 5311721 in words is "five million, three hundred eleven thousand, seven hundred twenty-one".