5451721 has 4 divisors (see below), whose sum is σ = 5947344. Its totient is φ = 4956100.

The previous prime is 5451709. The next prime is 5451731. The reversal of 5451721 is 1271545.

5451721 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5451721 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5451701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247795 + ... + 247816.

It is an arithmetic number, because the mean of its divisors is an integer number (1486836).

Almost surely, 2^5451721 is an apocalyptic number.

It is an amenable number.

5451721 is a deficient number, since it is larger than the sum of its proper divisors (495623).

5451721 is a wasteful number, since it uses less digits than its factorization.

5451721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495622.

The product of its digits is 1400, while the sum is 25.

The square root of 5451721 is about 2334.8920745936. The cubic root of 5451721 is about 175.9994081419. Note that the first 3 decimals are identical.

The spelling of 5451721 in words is "five million, four hundred fifty-one thousand, seven hundred twenty-one".