1989133 has 2 divisors, whose sum is σ = 1989134. Its totient is φ = 1989132.

The previous prime is 1989131. The next prime is 1989151. The reversal of 1989133 is 3319891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1814409 + 174724 = 1347^2 + 418^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989133 - 2¹ = 1989131 is a prime.

Together with 1989131, it forms a pair of twin primes.

1989133 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989131) 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 as a sum of consecutive naturals, namely, 994566 + 994567.

It is an arithmetic number, because the mean of its divisors is an integer number (994567).

2^1989133 is an apocalyptic number.

It is an amenable number.

1989133 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989133 is an equidigital number, since it uses as much as digits as its factorization.

1989133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 34.

The square root of 1989133 is about 1410.3662644859. The cubic root of 1989133 is about 125.7634977415.

It can be divided in two parts, 198913 and 3, that added together give a square (198916 = 446²).

The spelling of 1989133 in words is "one million, nine hundred eighty-nine thousand, one hundred thirty-three".