720691493 has 2 divisors, whose sum is σ = 720691494. Its totient is φ = 720691492.

The previous prime is 720691487. The next prime is 720691547. The reversal of 720691493 is 394196027.

720691493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 585736804 + 134954689 = 24202^2 + 11617^2 .

It is a cyclic number.

It is not a de Polignac number, because 720691493 - 2⁶ = 720691429 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 720691493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720694493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360345746 + 360345747.

It is an arithmetic number, because the mean of its divisors is an integer number (360345747).

Almost surely, 2^720691493 is an apocalyptic number.

It is an amenable number.

720691493 is a deficient number, since it is larger than the sum of its proper divisors (1).

720691493 is an equidigital number, since it uses as much as digits as its factorization.

720691493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 720691493 is about 26845.6978490037. The cubic root of 720691493 is about 896.5677889860.

The spelling of 720691493 in words is "seven hundred twenty million, six hundred ninety-one thousand, four hundred ninety-three".