1201221201161 has 2 divisors, whose sum is σ = 1201221201162. Its totient is φ = 1201221201160.

The previous prime is 1201221201149. The next prime is 1201221201247. The reversal of 1201221201161 is 1611021221021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 612846294025 + 588374907136 = 782845^2 + 767056^2 .

It is an emirp because it is prime and its reverse (1611021221021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201221201161 - 2⁶ = 1201221201097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1201221201461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600610600580 + 600610600581.

It is an arithmetic number, because the mean of its divisors is an integer number (600610600581).

Almost surely, 2^{1201221201161} is an apocalyptic number.

It is an amenable number.

1201221201161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201221201161 is an equidigital number, since it uses as much as digits as its factorization.

1201221201161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 1201221201161 its reverse (1611021221021), we get a palindrome (2812242422182).

The spelling of 1201221201161 in words is "one trillion, two hundred one billion, two hundred twenty-one million, two hundred one thousand, one hundred sixty-one".