1111231209 has 12 divisors (see below), whose sum is σ = 1628581808. Its totient is φ = 673473240.

The previous prime is 1111231201. The next prime is 1111231229. The reversal of 1111231209 is 9021321111.

It is a happy number.

It is not a de Polignac number, because 1111231209 - 2³ = 1111231201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1111231201) 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 in 11 ways as a sum of consecutive naturals, for example, 1530259 + ... + 1530984.

Almost surely, 2^1111231209 is an apocalyptic number.

It is an amenable number.

1111231209 is a deficient number, since it is larger than the sum of its proper divisors (517350599).

1111231209 is a wasteful number, since it uses less digits than its factorization.

1111231209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3061268 (or 3061257 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 21.

The square root of 1111231209 is about 33335.1347529900. The cubic root of 1111231209 is about 1035.7814845133.

The spelling of 1111231209 in words is "one billion, one hundred eleven million, two hundred thirty-one thousand, two hundred nine".