721304113 has 4 divisors (see below), whose sum is σ = 729994608. Its totient is φ = 712613620.

The previous prime is 721304107. The next prime is 721304119. The reversal of 721304113 is 311403127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (721304107) and next prime (721304119).

It is a cyclic number.

It is not a de Polignac number, because 721304113 - 2¹⁷ = 721173041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721304119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4345123 + ... + 4345288.

It is an arithmetic number, because the mean of its divisors is an integer number (182498652).

Almost surely, 2^721304113 is an apocalyptic number.

It is an amenable number.

721304113 is a deficient number, since it is larger than the sum of its proper divisors (8690495).

721304113 is an equidigital number, since it uses as much as digits as its factorization.

721304113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8690494.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 721304113 is about 26857.1054471624. The cubic root of 721304113 is about 896.8217579437.

The spelling of 721304113 in words is "seven hundred twenty-one million, three hundred four thousand, one hundred thirteen".