1243153189 has 4 divisors (see below), whose sum is σ = 1252643040. Its totient is φ = 1233663340.

The previous prime is 1243153183. The next prime is 1243153193. The reversal of 1243153189 is 9813513421.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9813513421 = 7873 ⋅1246477.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243153189 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 (1243153183) 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 in 3 ways as a sum of consecutive naturals, for example, 4744729 + ... + 4744990.

It is an arithmetic number, because the mean of its divisors is an integer number (313160760).

Almost surely, 2^1243153189 is an apocalyptic number.

It is an amenable number.

1243153189 is a deficient number, since it is larger than the sum of its proper divisors (9489851).

1243153189 is an equidigital number, since it uses as much as digits as its factorization.

1243153189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9489850.

The product of its digits is 25920, while the sum is 37.

The square root of 1243153189 is about 35258.3775718623. The cubic root of 1243153189 is about 1075.2469420799.

The spelling of 1243153189 in words is "one billion, two hundred forty-three million, one hundred fifty-three thousand, one hundred eighty-nine".