1221129 has 48 divisors (see below), whose sum is σ = 2298240. Its totient is φ = 635040.

The previous prime is 1221119. The next prime is 1221131. The reversal of 1221129 is 9211221.

It is not a de Polignac number, because 1221129 - 2⁴ = 1221113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17164 + ... + 17234.

It is an arithmetic number, because the mean of its divisors is an integer number (47880).

2^1221129 is an apocalyptic number.

It is an amenable number.

1221129 is a deficient number, since it is larger than the sum of its proper divisors (1077111).

1221129 is a wasteful number, since it uses less digits than its factorization.

1221129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 94 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 1221129 is about 1105.0470578215. The cubic root of 1221129 is about 106.8859237834.

The spelling of 1221129 in words is "one million, two hundred twenty-one thousand, one hundred twenty-nine".