720542171 has 2 divisors, whose sum is σ = 720542172. Its totient is φ = 720542170.

The previous prime is 720542153. The next prime is 720542177. The reversal of 720542171 is 171245027.

It is a strong prime.

It is an emirp because it is prime and its reverse (171245027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 720542171 - 2¹⁴ = 720525787 is a prime.

It is not a weakly prime, because it can be changed into another prime (720542177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360271085 + 360271086.

It is an arithmetic number, because the mean of its divisors is an integer number (360271086).

Almost surely, 2^720542171 is an apocalyptic number.

720542171 is a deficient number, since it is larger than the sum of its proper divisors (1).

720542171 is an equidigital number, since it uses as much as digits as its factorization.

720542171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 720542171 is about 26842.9165889253. The cubic root of 720542171 is about 896.5058639488.

Adding to 720542171 its reverse (171245027), we get a palindrome (891787198).

The spelling of 720542171 in words is "seven hundred twenty million, five hundred forty-two thousand, one hundred seventy-one".