721409459 has 2 divisors, whose sum is σ = 721409460. Its totient is φ = 721409458.

The previous prime is 721409453. The next prime is 721409471. The reversal of 721409459 is 954904127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721409459 - 2⁴ = 721409443 is a prime.

It is not a weakly prime, because it can be changed into another prime (721409453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360704729 + 360704730.

It is an arithmetic number, because the mean of its divisors is an integer number (360704730).

Almost surely, 2^721409459 is an apocalyptic number.

721409459 is a deficient number, since it is larger than the sum of its proper divisors (1).

721409459 is an equidigital number, since it uses as much as digits as its factorization.

721409459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 721409459 is about 26859.0666070137. The cubic root of 721409459 is about 896.8654158979.

The spelling of 721409459 in words is "seven hundred twenty-one million, four hundred nine thousand, four hundred fifty-nine".