1220220129 has 8 divisors (see below), whose sum is σ = 1649875392. Its totient is φ = 802022480.

The previous prime is 1220220083. The next prime is 1220220137. The reversal of 1220220129 is 9210220221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220220129 - 2¹¹ = 1220218081 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1220220829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2864154 + ... + 2864579.

It is an arithmetic number, because the mean of its divisors is an integer number (206234424).

Almost surely, 2^1220220129 is an apocalyptic number.

It is an amenable number.

1220220129 is a deficient number, since it is larger than the sum of its proper divisors (429655263).

1220220129 is an equidigital number, since it uses as much as digits as its factorization.

1220220129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5728807.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1220220129 is about 34931.6493884844. The cubic root of 1220220129 is about 1068.5939925083.

The spelling of 1220220129 in words is "one billion, two hundred twenty million, two hundred twenty thousand, one hundred twenty-nine".