720201761 has 2 divisors, whose sum is σ = 720201762. Its totient is φ = 720201760.

The previous prime is 720201751. The next prime is 720201773. The reversal of 720201761 is 167102027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 559038736 + 161163025 = 23644^2 + 12695^2 .

It is a cyclic number.

It is not a de Polignac number, because 720201761 - 2⁶ = 720201697 is a prime.

It is a super-2 number, since 2×720201761² = 1037381153095002242, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 720201761.

It is not a weakly prime, because it can be changed into another prime (720201701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360100880 + 360100881.

It is an arithmetic number, because the mean of its divisors is an integer number (360100881).

Almost surely, 2^720201761 is an apocalyptic number.

It is an amenable number.

720201761 is a deficient number, since it is larger than the sum of its proper divisors (1).

720201761 is an equidigital number, since it uses as much as digits as its factorization.

720201761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 720201761 is about 26836.5750609127. The cubic root of 720201761 is about 896.3646611873.

Adding to 720201761 its reverse (167102027), we get a palindrome (887303788).

The spelling of 720201761 in words is "seven hundred twenty million, two hundred one thousand, seven hundred sixty-one".