5127721 has 4 divisors (see below), whose sum is σ = 5211844. Its totient is φ = 5043600.

The previous prime is 5127709. The next prime is 5127737. The reversal of 5127721 is 1277215.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1277215 = 5 ⋅255443.

It can be written as a sum of positive squares in 2 ways, for example, as 132496 + 4995225 = 364^2 + 2235^2 .

It is a cyclic number.

It is not a de Polignac number, because 5127721 - 2¹³ = 5119529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5107721) 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, 41970 + ... + 42091.

It is an arithmetic number, because the mean of its divisors is an integer number (1302961).

Almost surely, 2^5127721 is an apocalyptic number.

It is an amenable number.

5127721 is a deficient number, since it is larger than the sum of its proper divisors (84123).

5127721 is an equidigital number, since it uses as much as digits as its factorization.

5127721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84122.

The product of its digits is 980, while the sum is 25.

The square root of 5127721 is about 2264.4471731529. The cubic root of 5127721 is about 172.4413691382.

It can be divided in two parts, 51 and 27721, that added together give a palindrome (27772).

The spelling of 5127721 in words is "five million, one hundred twenty-seven thousand, seven hundred twenty-one".