721163 has 2 divisors, whose sum is σ = 721164. Its totient is φ = 721162.

The previous prime is 721159. The next prime is 721169. The reversal of 721163 is 361127.

It is a happy number.

721163 is nontrivially palindromic in base 16.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721163 - 2² = 721159 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (721169) 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, 360581 + 360582.

It is an arithmetic number, because the mean of its divisors is an integer number (360582).

2⁷²¹¹⁶³ is an apocalyptic number.

721163 is a deficient number, since it is larger than the sum of its proper divisors (1).

721163 is an equidigital number, since it uses as much as digits as its factorization.

721163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252, while the sum is 20.

The square root of 721163 is about 849.2131652300. The cubic root of 721163 is about 89.6763270610.

The spelling of 721163 in words is "seven hundred twenty-one thousand, one hundred sixty-three".