1891133 has 2 divisors, whose sum is σ = 1891134. Its totient is φ = 1891132.

The previous prime is 1891111. The next prime is 1891147. The reversal of 1891133 is 3311981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1776889 + 114244 = 1333^2 + 338^2 .

It is a cyclic number.

It is not a de Polignac number, because 1891133 - 2⁶ = 1891069 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1891103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945566 + 945567.

It is an arithmetic number, because the mean of its divisors is an integer number (945567).

2^1891133 is an apocalyptic number.

It is an amenable number.

1891133 is a deficient number, since it is larger than the sum of its proper divisors (1).

1891133 is an equidigital number, since it uses as much as digits as its factorization.

1891133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 1891133 is about 1375.1847148656. The cubic root of 1891133 is about 123.6632599651.

The spelling of 1891133 in words is "one million, eight hundred ninety-one thousand, one hundred thirty-three".