1220129 has 4 divisors (see below), whose sum is σ = 1259520. Its totient is φ = 1180740.

The previous prime is 1220099. The next prime is 1220147. The reversal of 1220129 is 9210221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1220129 - 2²⁰ = 171553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1220029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19649 + ... + 19710.

It is an arithmetic number, because the mean of its divisors is an integer number (314880).

2^1220129 is an apocalyptic number.

It is an amenable number.

1220129 is a deficient number, since it is larger than the sum of its proper divisors (39391).

1220129 is an equidigital number, since it uses as much as digits as its factorization.

1220129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39390.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1220129 is about 1104.5944957314. The cubic root of 1220129 is about 106.8567390115.

The spelling of 1220129 in words is "one million, two hundred twenty thousand, one hundred twenty-nine".