1211155133 has 8 divisors (see below), whose sum is σ = 1292857920. Its totient is φ = 1131248160.

The previous prime is 1211155117. The next prime is 1211155139. The reversal of 1211155133 is 3315511121.

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 1211155133 - 2⁴ = 1211155117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211155099 and 1211155108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211155139) 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 7 ways as a sum of consecutive naturals, for example, 447560 + ... + 450257.

It is an arithmetic number, because the mean of its divisors is an integer number (161607240).

Almost surely, 2^1211155133 is an apocalyptic number.

It is an amenable number.

1211155133 is a deficient number, since it is larger than the sum of its proper divisors (81702787).

1211155133 is an equidigital number, since it uses as much as digits as its factorization.

1211155133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897907.

The product of its digits is 450, while the sum is 23.

The square root of 1211155133 is about 34801.6541704557. The cubic root of 1211155133 is about 1065.9412232176.

Adding to 1211155133 its reverse (3315511121), we get a palindrome (4526666254).

The spelling of 1211155133 in words is "one billion, two hundred eleven million, one hundred fifty-five thousand, one hundred thirty-three".