720100517 has 2 divisors, whose sum is σ = 720100518. Its totient is φ = 720100516.

The previous prime is 720100499. The next prime is 720100553. The reversal of 720100517 is 715001027.

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., 591754276 + 128346241 = 24326^2 + 11329^2 .

It is a cyclic number.

It is not a de Polignac number, because 720100517 - 2¹⁸ = 719838373 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 720100492 and 720100501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720100597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360050258 + 360050259.

It is an arithmetic number, because the mean of its divisors is an integer number (360050259).

Almost surely, 2^720100517 is an apocalyptic number.

It is an amenable number.

720100517 is a deficient number, since it is larger than the sum of its proper divisors (1).

720100517 is an equidigital number, since it uses as much as digits as its factorization.

720100517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 720100517 is about 26834.6886883377. The cubic root of 720100517 is about 896.3226563855.

The spelling of 720100517 in words is "seven hundred twenty million, one hundred thousand, five hundred seventeen".