1091889 has 6 divisors (see below), whose sum is σ = 1577186. Its totient is φ = 727920.

The previous prime is 1091887. The next prime is 1091917. The reversal of 1091889 is 9881901.

It can be written as a sum of positive squares in only one way, i.e., 1034289 + 57600 = 1017^2 + 240^2 .

It is not a de Polignac number, because 1091889 - 2¹ = 1091887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091887) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60652 + ... + 60669.

2^1091889 is an apocalyptic number.

It is an amenable number.

1091889 is a deficient number, since it is larger than the sum of its proper divisors (485297).

1091889 is a wasteful number, since it uses less digits than its factorization.

1091889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121327 (or 121324 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 1091889 is about 1044.9349262035. The cubic root of 1091889 is about 102.9736634207.

The spelling of 1091889 in words is "one million, ninety-one thousand, eight hundred eighty-nine".