721700843 has 2 divisors, whose sum is σ = 721700844. Its totient is φ = 721700842.

The previous prime is 721700783. The next prime is 721700867. The reversal of 721700843 is 348007127.

It is a happy number.

721700843 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721700843 is a prime.

It is not a weakly prime, because it can be changed into another prime (721700443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360850421 + 360850422.

It is an arithmetic number, because the mean of its divisors is an integer number (360850422).

Almost surely, 2^721700843 is an apocalyptic number.

721700843 is a deficient number, since it is larger than the sum of its proper divisors (1).

721700843 is an equidigital number, since it uses as much as digits as its factorization.

721700843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 721700843 is about 26864.4903729812. The cubic root of 721700843 is about 896.9861504092.

The spelling of 721700843 in words is "seven hundred twenty-one million, seven hundred thousand, eight hundred forty-three".