5171721 has 8 divisors (see below), whose sum is σ = 6925440. Its totient is φ = 3432912.

The previous prime is 5171693. The next prime is 5171729. The reversal of 5171721 is 1271715.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5171721 - 2⁹ = 5171209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5171691 and 5171700.

It is not an unprimeable number, because it can be changed into a prime (5171729) 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 7 ways as a sum of consecutive naturals, for example, 2890 + ... + 4323.

It is an arithmetic number, because the mean of its divisors is an integer number (865680).

Almost surely, 2^5171721 is an apocalyptic number.

It is an amenable number.

5171721 is a deficient number, since it is larger than the sum of its proper divisors (1753719).

5171721 is a wasteful number, since it uses less digits than its factorization.

5171721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7455.

The product of its digits is 490, while the sum is 24.

The square root of 5171721 is about 2274.1418161584. The cubic root of 5171721 is about 172.9331939365.

The spelling of 5171721 in words is "five million, one hundred seventy-one thousand, seven hundred twenty-one".