1211530133 has 8 divisors (see below), whose sum is σ = 1324658016. Its totient is φ = 1098900400.

The previous prime is 1211530093. The next prime is 1211530141. The reversal of 1211530133 is 3310351121.

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 1211530133 - 2¹⁴ = 1211513749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211530153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119438 + ... + 129183.

It is an arithmetic number, because the mean of its divisors is an integer number (165582252).

Almost surely, 2^1211530133 is an apocalyptic number.

It is an amenable number.

1211530133 is a deficient number, since it is larger than the sum of its proper divisors (113127883).

1211530133 is a wasteful number, since it uses less digits than its factorization.

1211530133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249075.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 1211530133 is about 34807.0414284236. The cubic root of 1211530133 is about 1066.0512247360.

Adding to 1211530133 its reverse (3310351121), we get a palindrome (4521881254).

The spelling of 1211530133 in words is "one billion, two hundred eleven million, five hundred thirty thousand, one hundred thirty-three".