721499 has 2 divisors, whose sum is σ = 721500. Its totient is φ = 721498.

The previous prime is 721481. The next prime is 721529. The reversal of 721499 is 994127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721499 - 2⁸ = 721243 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721499.

It is not a weakly prime, because it can be changed into another prime (721439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360749 + 360750.

It is an arithmetic number, because the mean of its divisors is an integer number (360750).

2⁷²¹⁴⁹⁹ is an apocalyptic number.

721499 is a deficient number, since it is larger than the sum of its proper divisors (1).

721499 is an equidigital number, since it uses as much as digits as its factorization.

721499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 32.

The square root of 721499 is about 849.4109723803. The cubic root of 721499 is about 89.6902520533.

The spelling of 721499 in words is "seven hundred twenty-one thousand, four hundred ninety-nine".