720067261 has 2 divisors, whose sum is σ = 720067262. Its totient is φ = 720067260.

The previous prime is 720067253. The next prime is 720067273. The reversal of 720067261 is 162760027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 361722361 + 358344900 = 19019^2 + 18930^2 .

It is a cyclic number.

It is not a de Polignac number, because 720067261 - 2³ = 720067253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720067561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360033630 + 360033631.

It is an arithmetic number, because the mean of its divisors is an integer number (360033631).

Almost surely, 2^720067261 is an apocalyptic number.

It is an amenable number.

720067261 is a deficient number, since it is larger than the sum of its proper divisors (1).

720067261 is an equidigital number, since it uses as much as digits as its factorization.

720067261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 720067261 is about 26834.0690354631. The cubic root of 720067261 is about 896.3088580502.

The spelling of 720067261 in words is "seven hundred twenty million, sixty-seven thousand, two hundred sixty-one".