1201231232209 has 2 divisors, whose sum is σ = 1201231232210. Its totient is φ = 1201231232208.

The previous prime is 1201231232191. The next prime is 1201231232213. The reversal of 1201231232209 is 9022321321021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1200733808400 + 497423809 = 1095780^2 + 22303^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201231232209 - 2⁷ = 1201231232081 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201231232219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600615616104 + 600615616105.

It is an arithmetic number, because the mean of its divisors is an integer number (600615616105).

Almost surely, 2^{1201231232209} is an apocalyptic number.

It is an amenable number.

1201231232209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201231232209 is an equidigital number, since it uses as much as digits as its factorization.

1201231232209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 1201231232209 in words is "one trillion, two hundred one billion, two hundred thirty-one million, two hundred thirty-two thousand, two hundred nine".