721630223 has 2 divisors, whose sum is σ = 721630224. Its totient is φ = 721630222.

The previous prime is 721630219. The next prime is 721630237. The reversal of 721630223 is 322036127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721630223 - 2² = 721630219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 721630192 and 721630201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721630253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360815111 + 360815112.

It is an arithmetic number, because the mean of its divisors is an integer number (360815112).

Almost surely, 2^721630223 is an apocalyptic number.

721630223 is a deficient number, since it is larger than the sum of its proper divisors (1).

721630223 is an equidigital number, since it uses as much as digits as its factorization.

721630223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 721630223 is about 26863.1759663670. The cubic root of 721630223 is about 896.9568921051.

The spelling of 721630223 in words is "seven hundred twenty-one million, six hundred thirty thousand, two hundred twenty-three".