720701161 has 2 divisors, whose sum is σ = 720701162. Its totient is φ = 720701160.

The previous prime is 720701147. The next prime is 720701249. The reversal of 720701161 is 161107027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 575040400 + 145660761 = 23980^2 + 12069^2 .

It is an emirp because it is prime and its reverse (161107027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 720701161 - 2⁹ = 720700649 is a prime.

It is not a weakly prime, because it can be changed into another prime (720701131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360350580 + 360350581.

It is an arithmetic number, because the mean of its divisors is an integer number (360350581).

Almost surely, 2^720701161 is an apocalyptic number.

It is an amenable number.

720701161 is a deficient number, since it is larger than the sum of its proper divisors (1).

720701161 is an equidigital number, since it uses as much as digits as its factorization.

720701161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 720701161 is about 26845.8779144956. The cubic root of 720701161 is about 896.5717980887.

Adding to 720701161 its reverse (161107027), we get a palindrome (881808188).

The spelling of 720701161 in words is "seven hundred twenty million, seven hundred one thousand, one hundred sixty-one".