720535913 has 2 divisors, whose sum is σ = 720535914. Its totient is φ = 720535912.

The previous prime is 720535877. The next prime is 720535961. The reversal of 720535913 is 319535027.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 451477504 + 269058409 = 21248^2 + 16403^2 .

It is a cyclic number.

It is not a de Polignac number, because 720535913 - 2⁸ = 720535657 is a prime.

It is not a weakly prime, because it can be changed into another prime (720531913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360267956 + 360267957.

It is an arithmetic number, because the mean of its divisors is an integer number (360267957).

Almost surely, 2^720535913 is an apocalyptic number.

It is an amenable number.

720535913 is a deficient number, since it is larger than the sum of its proper divisors (1).

720535913 is an equidigital number, since it uses as much as digits as its factorization.

720535913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28350, while the sum is 35.

The square root of 720535913 is about 26842.8000216073. The cubic root of 720535913 is about 896.5032685190.

The spelling of 720535913 in words is "seven hundred twenty million, five hundred thirty-five thousand, nine hundred thirteen".