1128121 has 8 divisors (see below), whose sum is σ = 1177088. Its totient is φ = 1080000.

The previous prime is 1128109. The next prime is 1128143. The reversal of 1128121 is 1218211.

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

It is a 4-Lehmer number, since φ(1128121) divides (1128121-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 1128121 - 2⁵ = 1128089 is a prime.

It is a Duffinian number.

1128121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1128095 and 1128104.

It is not an unprimeable number, because it can be changed into a prime (1128151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4561 + ... + 4801.

It is an arithmetic number, because the mean of its divisors is an integer number (147136).

It is a Poulet number, since it divides 2^1128120-1.

2^1128121 is an apocalyptic number.

It is an amenable number.

1128121 is a deficient number, since it is larger than the sum of its proper divisors (48967).

1128121 is a wasteful number, since it uses less digits than its factorization.

1128121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423.

The product of its digits is 32, while the sum is 16.

The square root of 1128121 is about 1062.1304063061. The cubic root of 1128121 is about 104.1002792635.

The spelling of 1128121 in words is "one million, one hundred twenty-eight thousand, one hundred twenty-one".