1131221033 has 4 divisors (see below), whose sum is σ = 1132242180. Its totient is φ = 1130199888.

The previous prime is 1131221023. The next prime is 1131221053. The reversal of 1131221033 is 3301221311.

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 66373609 + 1064847424 = 8147^2 + 32632^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131221033 - 2¹⁰ = 1131220009 is a prime.

It is a super-2 number, since 2×1131221033² = 2559322051003174178, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1131221023) 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, 508910 + ... + 511127.

It is an arithmetic number, because the mean of its divisors is an integer number (283060545).

Almost surely, 2^1131221033 is an apocalyptic number.

It is an amenable number.

1131221033 is a deficient number, since it is larger than the sum of its proper divisors (1021147).

1131221033 is a wasteful number, since it uses less digits than its factorization.

1131221033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021146.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1131221033 is about 33633.6294948969. The cubic root of 1131221033 is about 1041.9554657060.

Adding to 1131221033 its reverse (3301221311), we get a palindrome (4432442344).

The spelling of 1131221033 in words is "one billion, one hundred thirty-one million, two hundred twenty-one thousand, thirty-three".