31223311133 has 4 divisors (see below), whose sum is σ = 35683784160. Its totient is φ = 26762838108.

The previous prime is 31223311127. The next prime is 31223311151. The reversal of 31223311133 is 33111332213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33111332213 = 7393 ⋅4478741.

It is a cyclic number.

It is not a de Polignac number, because 31223311133 - 2²⁰ = 31222262557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31223311099 and 31223311108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31223311333) 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, 2230236503 + ... + 2230236516.

It is an arithmetic number, because the mean of its divisors is an integer number (8920946040).

Almost surely, 2^31223311133 is an apocalyptic number.

It is an amenable number.

31223311133 is a deficient number, since it is larger than the sum of its proper divisors (4460473027).

31223311133 is an equidigital number, since it uses as much as digits as its factorization.

31223311133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4460473026.

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

Adding to 31223311133 its reverse (33111332213), we get a palindrome (64334643346).

The spelling of 31223311133 in words is "thirty-one billion, two hundred twenty-three million, three hundred eleven thousand, one hundred thirty-three".