31122211133 has 4 divisors (see below), whose sum is σ = 33516227388. Its totient is φ = 28728194880.

The previous prime is 31122211129. The next prime is 31122211139. The reversal of 31122211133 is 33111222113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33111222113 = 71011 ⋅466283.

It can be written as a sum of positive squares in 2 ways, for example, as 10149958009 + 20972253124 = 100747^2 + 144818^2 .

It is a cyclic number.

It is not a de Polignac number, because 31122211133 - 2² = 31122211129 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31122211139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1197008108 + ... + 1197008133.

It is an arithmetic number, because the mean of its divisors is an integer number (8379056847).

Almost surely, 2^31122211133 is an apocalyptic number.

It is an amenable number.

31122211133 is a deficient number, since it is larger than the sum of its proper divisors (2394016255).

31122211133 is a wasteful number, since it uses less digits than its factorization.

31122211133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2394016254.

The product of its digits is 216, while the sum is 20.

Adding to 31122211133 its reverse (33111222113), we get a palindrome (64233433246).

The spelling of 31122211133 in words is "thirty-one billion, one hundred twenty-two million, two hundred eleven thousand, one hundred thirty-three".