31133223313 has 4 divisors (see below), whose sum is σ = 31571719488. Its totient is φ = 30694727140.

The previous prime is 31133223301. The next prime is 31133223397. The reversal of 31133223313 is 31332233113.

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: 31332233113 = 139813 ⋅224101.

It is a cyclic number.

It is not a de Polignac number, because 31133223313 - 2²⁵ = 31099668881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31133221313) 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, 219247981 + ... + 219248122.

It is an arithmetic number, because the mean of its divisors is an integer number (7892929872).

Almost surely, 2^31133223313 is an apocalyptic number.

It is an amenable number.

31133223313 is a deficient number, since it is larger than the sum of its proper divisors (438496175).

31133223313 is an equidigital number, since it uses as much as digits as its factorization.

31133223313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438496174.

The product of its digits is 2916, while the sum is 25.

Adding to 31133223313 its reverse (31332233113), we get a palindrome (62465456426).

The spelling of 31133223313 in words is "thirty-one billion, one hundred thirty-three million, two hundred twenty-three thousand, three hundred thirteen".