1201220129 has 2 divisors, whose sum is σ = 1201220130. Its totient is φ = 1201220128.

The previous prime is 1201220087. The next prime is 1201220131. The reversal of 1201220129 is 9210221021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1179579025 + 21641104 = 34345^2 + 4652^2 .

It is an emirp because it is prime and its reverse (9210221021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201220129 - 2¹² = 1201216033 is a prime.

Together with 1201220131, it forms a pair of twin primes.

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 1201220129.

It is not a weakly prime, because it can be changed into another prime (1201220159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600610064 + 600610065.

It is an arithmetic number, because the mean of its divisors is an integer number (600610065).

Almost surely, 2^1201220129 is an apocalyptic number.

It is an amenable number.

1201220129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201220129 is an equidigital number, since it uses as much as digits as its factorization.

1201220129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1201220129 is about 34658.6227222029. The cubic root of 1201220129 is about 1063.0186084443.

The spelling of 1201220129 in words is "one billion, two hundred one million, two hundred twenty thousand, one hundred twenty-nine".