1491834189 has 4 divisors (see below), whose sum is σ = 1989112256. Its totient is φ = 994556124.

The previous prime is 1491834163. The next prime is 1491834203. The reversal of 1491834189 is 9814381941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1491834189 - 2¹³ = 1491825997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491834139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248639029 + ... + 248639034.

It is an arithmetic number, because the mean of its divisors is an integer number (497278064).

Almost surely, 2^1491834189 is an apocalyptic number.

It is an amenable number.

1491834189 is a deficient number, since it is larger than the sum of its proper divisors (497278067).

1491834189 is an equidigital number, since it uses as much as digits as its factorization.

1491834189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497278066.

The product of its digits is 248832, while the sum is 48.

The square root of 1491834189 is about 38624.2694299840. The cubic root of 1491834189 is about 1142.6332350241.

The spelling of 1491834189 in words is "one billion, four hundred ninety-one million, eight hundred thirty-four thousand, one hundred eighty-nine".