720574681 has 2 divisors, whose sum is σ = 720574682. Its totient is φ = 720574680.

The previous prime is 720574661. The next prime is 720574691. The reversal of 720574681 is 186475027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 548309056 + 172265625 = 23416^2 + 13125^2 .

It is an emirp because it is prime and its reverse (186475027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 720574681 - 2²³ = 712186073 is a prime.

It is a super-2 number, since 2×720574681² = 1038455741796503522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (720574651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360287340 + 360287341.

It is an arithmetic number, because the mean of its divisors is an integer number (360287341).

Almost surely, 2^720574681 is an apocalyptic number.

It is an amenable number.

720574681 is a deficient number, since it is larger than the sum of its proper divisors (1).

720574681 is an equidigital number, since it uses as much as digits as its factorization.

720574681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 720574681 is about 26843.5221422227. The cubic root of 720574681 is about 896.5193468364.

The spelling of 720574681 in words is "seven hundred twenty million, five hundred seventy-four thousand, six hundred eighty-one".