5445721 has 2 divisors, whose sum is σ = 5445722. Its totient is φ = 5445720.

The previous prime is 5445719. The next prime is 5445757. The reversal of 5445721 is 1275445.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4862025 + 583696 = 2205^2 + 764^2 .

It is a cyclic number.

It is not a de Polignac number, because 5445721 - 2¹ = 5445719 is a prime.

Together with 5445719, it forms a pair of twin primes.

5445721 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 5445721.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5445221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2722860 + 2722861.

It is an arithmetic number, because the mean of its divisors is an integer number (2722861).

Almost surely, 2^5445721 is an apocalyptic number.

It is an amenable number.

5445721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5445721 is an equidigital number, since it uses as much as digits as its factorization.

5445721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5600, while the sum is 28.

The square root of 5445721 is about 2333.6068649196. The cubic root of 5445721 is about 175.9348178908.

The spelling of 5445721 in words is "five million, four hundred forty-five thousand, seven hundred twenty-one".