1989151 has 2 divisors, whose sum is σ = 1989152. Its totient is φ = 1989150.

The previous prime is 1989133. The next prime is 1989161. The reversal of 1989151 is 1519891.

It is a strong prime.

It is an emirp because it is prime and its reverse (1519891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1989151 - 2¹⁹ = 1464863 is a prime.

1989151 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994575 + 994576.

It is an arithmetic number, because the mean of its divisors is an integer number (994576).

2^1989151 is an apocalyptic number.

1989151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989151 is an equidigital number, since it uses as much as digits as its factorization.

1989151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 34.

The square root of 1989151 is about 1410.3726457926. The cubic root of 1989151 is about 125.7638770921.

It can be divided in two parts, 198915 and 1, that added together give a square (198916 = 446²).

The spelling of 1989151 in words is "one million, nine hundred eighty-nine thousand, one hundred fifty-one".