721043 has 2 divisors, whose sum is σ = 721044. Its totient is φ = 721042.

The previous prime is 721037. The next prime is 721051. The reversal of 721043 is 340127.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (340127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721043 - 2¹⁰ = 720019 is a prime.

It is a Sophie Germain prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721043.

It is not a weakly prime, because it can be changed into another prime (721003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360521 + 360522.

It is an arithmetic number, because the mean of its divisors is an integer number (360522).

2⁷²¹⁰⁴³ is an apocalyptic number.

721043 is a deficient number, since it is larger than the sum of its proper divisors (1).

721043 is an equidigital number, since it uses as much as digits as its factorization.

721043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 721043 is about 849.1425086521. The cubic root of 721043 is about 89.6713528013.

The spelling of 721043 in words is "seven hundred twenty-one thousand, forty-three", and thus it is an iban number.