721501499 has 2 divisors, whose sum is σ = 721501500. Its totient is φ = 721501498.

The previous prime is 721501483. The next prime is 721501511. The reversal of 721501499 is 994105127.

721501499 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (994105127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721501499 - 2⁴ = 721501483 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (721507499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360750749 + 360750750.

It is an arithmetic number, because the mean of its divisors is an integer number (360750750).

Almost surely, 2^721501499 is an apocalyptic number.

721501499 is a deficient number, since it is larger than the sum of its proper divisors (1).

721501499 is an equidigital number, since it uses as much as digits as its factorization.

721501499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 721501499 is about 26860.7799402772. The cubic root of 721501499 is about 896.9035560422.

The spelling of 721501499 in words is "seven hundred twenty-one million, five hundred one thousand, four hundred ninety-nine".