721473563 has 2 divisors, whose sum is σ = 721473564. Its totient is φ = 721473562.

The previous prime is 721473559. The next prime is 721473581. The reversal of 721473563 is 365374127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721473563 - 2² = 721473559 is a prime.

It is not a weakly prime, because it can be changed into another prime (721473503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360736781 + 360736782.

It is an arithmetic number, because the mean of its divisors is an integer number (360736782).

Almost surely, 2^721473563 is an apocalyptic number.

721473563 is a deficient number, since it is larger than the sum of its proper divisors (1).

721473563 is an equidigital number, since it uses as much as digits as its factorization.

721473563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 38.

The square root of 721473563 is about 26860.2599205592. The cubic root of 721473563 is about 896.8919800805.

The spelling of 721473563 in words is "seven hundred twenty-one million, four hundred seventy-three thousand, five hundred sixty-three".