1128181 has 2 divisors, whose sum is σ = 1128182. Its totient is φ = 1128180.

The previous prime is 1128161. The next prime is 1128209. The reversal of 1128181 is 1818211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 749956 + 378225 = 866^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128181 - 2¹⁷ = 997109 is a prime.

It is a super-2 number, since 2×1128181² = 2545584737522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1128151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564090 + 564091.

It is an arithmetic number, because the mean of its divisors is an integer number (564091).

2^1128181 is an apocalyptic number.

It is an amenable number.

1128181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128181 is an equidigital number, since it uses as much as digits as its factorization.

1128181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128, while the sum is 22.

The square root of 1128181 is about 1062.1586510498. The cubic root of 1128181 is about 104.1021247824.

The spelling of 1128181 in words is "one million, one hundred twenty-eight thousand, one hundred eighty-one".