1161122021209 has 2 divisors, whose sum is σ = 1161122021210. Its totient is φ = 1161122021208.

The previous prime is 1161122021153. The next prime is 1161122021237. The reversal of 1161122021209 is 9021202211611.

It is an a-pointer prime, because the next prime (1161122021237) can be obtained adding 1161122021209 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1132787705625 + 28334315584 = 1064325^2 + 168328^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161122021209 - 2¹⁹ = 1161121496921 is a prime.

It is not a weakly prime, because it can be changed into another prime (1161122021009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580561010604 + 580561010605.

It is an arithmetic number, because the mean of its divisors is an integer number (580561010605).

Almost surely, 2^{1161122021209} is an apocalyptic number.

It is an amenable number.

1161122021209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161122021209 is an equidigital number, since it uses as much as digits as its factorization.

1161122021209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 28.

The spelling of 1161122021209 in words is "one trillion, one hundred sixty-one billion, one hundred twenty-two million, twenty-one thousand, two hundred nine".