721700117 has 2 divisors, whose sum is σ = 721700118. Its totient is φ = 721700116.

The previous prime is 721700113. The next prime is 721700149. The reversal of 721700117 is 711007127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 615486481 + 106213636 = 24809^2 + 10306^2 .

It is a cyclic number.

It is not a de Polignac number, because 721700117 - 2² = 721700113 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721700113) 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, 360850058 + 360850059.

It is an arithmetic number, because the mean of its divisors is an integer number (360850059).

Almost surely, 2^721700117 is an apocalyptic number.

It is an amenable number.

721700117 is a deficient number, since it is larger than the sum of its proper divisors (1).

721700117 is an equidigital number, since it uses as much as digits as its factorization.

721700117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 686, while the sum is 26.

The square root of 721700117 is about 26864.4768607170. The cubic root of 721700117 is about 896.9858496326.

The spelling of 721700117 in words is "seven hundred twenty-one million, seven hundred thousand, one hundred seventeen".