721530113 has 2 divisors, whose sum is σ = 721530114. Its totient is φ = 721530112.

The previous prime is 721530101. The next prime is 721530119. The reversal of 721530113 is 311035127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 398681089 + 322849024 = 19967^2 + 17968^2 .

It is a cyclic number.

It is not a de Polignac number, because 721530113 - 2⁶ = 721530049 is a prime.

It is not a weakly prime, because it can be changed into another prime (721530119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360765056 + 360765057.

It is an arithmetic number, because the mean of its divisors is an integer number (360765057).

Almost surely, 2^721530113 is an apocalyptic number.

It is an amenable number.

721530113 is a deficient number, since it is larger than the sum of its proper divisors (1).

721530113 is an equidigital number, since it uses as much as digits as its factorization.

721530113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 721530113 is about 26861.3125703120. The cubic root of 721530113 is about 896.9154126399.

The spelling of 721530113 in words is "seven hundred twenty-one million, five hundred thirty thousand, one hundred thirteen".