720826013 has 2 divisors, whose sum is σ = 720826014. Its totient is φ = 720826012.

The previous prime is 720825997. The next prime is 720826031. The reversal of 720826013 is 310628027.

It is a happy number.

Together with next prime (720826031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657512164 + 63313849 = 25642^2 + 7957^2 .

It is an emirp because it is prime and its reverse (310628027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 720826013 - 2⁴ = 720825997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720826213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360413006 + 360413007.

It is an arithmetic number, because the mean of its divisors is an integer number (360413007).

Almost surely, 2^720826013 is an apocalyptic number.

It is an amenable number.

720826013 is a deficient number, since it is larger than the sum of its proper divisors (1).

720826013 is an equidigital number, since it uses as much as digits as its factorization.

720826013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 720826013 is about 26848.2031614781. The cubic root of 720826013 is about 896.6235681912.

The spelling of 720826013 in words is "seven hundred twenty million, eight hundred twenty-six thousand, thirteen".