1128551 has 4 divisors (see below), whose sum is σ = 1142232. Its totient is φ = 1114872.

The previous prime is 1128539. The next prime is 1128553. The reversal of 1128551 is 1558211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1558211 = 173 ⋅9007.

It is a cyclic number.

It is not a de Polignac number, because 1128551 - 2¹⁰ = 1127527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128553) 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, 6716 + ... + 6881.

It is an arithmetic number, because the mean of its divisors is an integer number (285558).

2^1128551 is an apocalyptic number.

1128551 is a deficient number, since it is larger than the sum of its proper divisors (13681).

1128551 is an equidigital number, since it uses as much as digits as its factorization.

1128551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13680.

The product of its digits is 400, while the sum is 23.

The square root of 1128551 is about 1062.3328103754. The cubic root of 1128551 is about 104.1135040369.

The spelling of 1128551 in words is "one million, one hundred twenty-eight thousand, five hundred fifty-one".