1229811189 has 4 divisors (see below), whose sum is σ = 1639748256. Its totient is φ = 819874124.

The previous prime is 1229811181. The next prime is 1229811211. The reversal of 1229811189 is 9811189221.

It is a happy number.

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: 9811189221 = 3 ⋅3270396407.

It is a cyclic number.

It is not a de Polignac number, because 1229811189 - 2³ = 1229811181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1229811189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229811181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204968529 + ... + 204968534.

It is an arithmetic number, because the mean of its divisors is an integer number (409937064).

Almost surely, 2^1229811189 is an apocalyptic number.

It is an amenable number.

1229811189 is a deficient number, since it is larger than the sum of its proper divisors (409937067).

1229811189 is an equidigital number, since it uses as much as digits as its factorization.

1229811189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409937066.

The product of its digits is 20736, while the sum is 42.

The square root of 1229811189 is about 35068.6639180907. The cubic root of 1229811189 is about 1071.3864430648.

The spelling of 1229811189 in words is "one billion, two hundred twenty-nine million, eight hundred eleven thousand, one hundred eighty-nine".