1131022213 has 4 divisors (see below), whose sum is σ = 1134378700. Its totient is φ = 1127665728.

The previous prime is 1131022201. The next prime is 1131022219. The reversal of 1131022213 is 3122201311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3122201311 = 181 ⋅17249731.

It can be written as a sum of positive squares in 2 ways, for example, as 609447969 + 521574244 = 24687^2 + 22838^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131022213 - 2⁵ = 1131022181 is a prime.

It is a super-2 number, since 2×1131022213² = 2558422492598834738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131022219) 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 3 ways as a sum of consecutive naturals, for example, 1677738 + ... + 1678411.

It is an arithmetic number, because the mean of its divisors is an integer number (283594675).

Almost surely, 2^1131022213 is an apocalyptic number.

It is an amenable number.

1131022213 is a deficient number, since it is larger than the sum of its proper divisors (3356487).

1131022213 is an equidigital number, since it uses as much as digits as its factorization.

1131022213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3356486.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1131022213 is about 33630.6736923303. The cubic root of 1131022213 is about 1041.8944184784.

Adding to 1131022213 its reverse (3122201311), we get a palindrome (4253223524).

The spelling of 1131022213 in words is "one billion, one hundred thirty-one million, twenty-two thousand, two hundred thirteen".