721500113 has 2 divisors, whose sum is σ = 721500114. Its totient is φ = 721500112.

The previous prime is 721500071. The next prime is 721500119. The reversal of 721500113 is 311005127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 455907904 + 265592209 = 21352^2 + 16297^2 .

It is a cyclic number.

It is not a de Polignac number, because 721500113 - 2¹⁸ = 721237969 is a prime.

It is not a weakly prime, because it can be changed into another prime (721500119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360750056 + 360750057.

It is an arithmetic number, because the mean of its divisors is an integer number (360750057).

Almost surely, 2^721500113 is an apocalyptic number.

It is an amenable number.

721500113 is a deficient number, since it is larger than the sum of its proper divisors (1).

721500113 is an equidigital number, since it uses as much as digits as its factorization.

721500113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 721500113 is about 26860.7541405672. The cubic root of 721500113 is about 896.9029817264.

The spelling of 721500113 in words is "seven hundred twenty-one million, five hundred thousand, one hundred thirteen".