31122133331 has 4 divisors (see below), whose sum is σ = 31407657600. Its totient is φ = 30836609064.

The previous prime is 31122133321. The next prime is 31122133337. The reversal of 31122133331 is 13333122113.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31122133331 is a prime.

It is a super-2 number, since 2×31122133331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31122133297 and 31122133306.

It is not an unprimeable number, because it can be changed into a prime (31122133337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142761971 + ... + 142762188.

It is an arithmetic number, because the mean of its divisors is an integer number (7851914400).

Almost surely, 2^31122133331 is an apocalyptic number.

31122133331 is a deficient number, since it is larger than the sum of its proper divisors (285524269).

31122133331 is a wasteful number, since it uses less digits than its factorization.

31122133331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285524268.

The product of its digits is 972, while the sum is 23.

Adding to 31122133331 its reverse (13333122113), we get a palindrome (44455255444).

The spelling of 31122133331 in words is "thirty-one billion, one hundred twenty-two million, one hundred thirty-three thousand, three hundred thirty-one".