5101721 has 4 divisors (see below), whose sum is σ = 5108532. Its totient is φ = 5094912.

The previous prime is 5101711. The next prime is 5101739. The reversal of 5101721 is 1271015.

5101721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 2088025 + 3013696 = 1445^2 + 1736^2 .

It is a cyclic number.

It is not a de Polignac number, because 5101721 - 2¹⁴ = 5085337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 5101721.

It is not an unprimeable number, because it can be changed into a prime (5101711) 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, 2120 + ... + 3833.

It is an arithmetic number, because the mean of its divisors is an integer number (1277133).

Almost surely, 2^5101721 is an apocalyptic number.

It is an amenable number.

5101721 is a deficient number, since it is larger than the sum of its proper divisors (6811).

5101721 is an equidigital number, since it uses as much as digits as its factorization.

5101721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6810.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 5101721 is about 2258.6989617919. The cubic root of 5101721 is about 172.1494217146.

Adding to 5101721 its reverse (1271015), we get a palindrome (6372736).

The spelling of 5101721 in words is "five million, one hundred one thousand, seven hundred twenty-one".