720505133 has 2 divisors, whose sum is σ = 720505134. Its totient is φ = 720505132.

The previous prime is 720505127. The next prime is 720505141. The reversal of 720505133 is 331505027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 706390084 + 14115049 = 26578^2 + 3757^2 .

It is a cyclic number.

It is not a de Polignac number, because 720505133 - 2⁴ = 720505117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720505103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360252566 + 360252567.

It is an arithmetic number, because the mean of its divisors is an integer number (360252567).

Almost surely, 2^720505133 is an apocalyptic number.

It is an amenable number.

720505133 is a deficient number, since it is larger than the sum of its proper divisors (1).

720505133 is an equidigital number, since it uses as much as digits as its factorization.

720505133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3150, while the sum is 26.

The square root of 720505133 is about 26842.2266773828. The cubic root of 720505133 is about 896.4905026674.

The spelling of 720505133 in words is "seven hundred twenty million, five hundred five thousand, one hundred thirty-three".