1211133145 has 8 divisors (see below), whose sum is σ = 1473269256. Its totient is φ = 955633536.

The previous prime is 1211133137. The next prime is 1211133163. The reversal of 1211133145 is 5413311121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3779136 + 1207354009 = 1944^2 + 34747^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211133145 - 2³ = 1211133137 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1658722 + ... + 1659451.

It is an arithmetic number, because the mean of its divisors is an integer number (184158657).

Almost surely, 2^1211133145 is an apocalyptic number.

It is an amenable number.

1211133145 is a deficient number, since it is larger than the sum of its proper divisors (262136111).

1211133145 is an equidigital number, since it uses as much as digits as its factorization.

1211133145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3318251.

The product of its digits is 360, while the sum is 22.

The square root of 1211133145 is about 34801.3382644978. The cubic root of 1211133145 is about 1065.9347726106.

Adding to 1211133145 its reverse (5413311121), we get a palindrome (6624444266).

The spelling of 1211133145 in words is "one billion, two hundred eleven million, one hundred thirty-three thousand, one hundred forty-five".