1212231133 has 4 divisors (see below), whose sum is σ = 1241797788. Its totient is φ = 1182664480.

The previous prime is 1212231127. The next prime is 1212231149. The reversal of 1212231133 is 3311322121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 471193849 + 741037284 = 21707^2 + 27222^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212231133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212231133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212231113) 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, 14783266 + ... + 14783347.

It is an arithmetic number, because the mean of its divisors is an integer number (310449447).

Almost surely, 2^1212231133 is an apocalyptic number.

It is an amenable number.

1212231133 is a deficient number, since it is larger than the sum of its proper divisors (29566655).

1212231133 is an equidigital number, since it uses as much as digits as its factorization.

1212231133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29566654.

The product of its digits is 216, while the sum is 19.

The square root of 1212231133 is about 34817.1097737879. The cubic root of 1212231133 is about 1066.2567933810.

Adding to 1212231133 its reverse (3311322121), we get a palindrome (4523553254).

The spelling of 1212231133 in words is "one billion, two hundred twelve million, two hundred thirty-one thousand, one hundred thirty-three".