31313326133 has 2 divisors, whose sum is σ = 31313326134. Its totient is φ = 31313326132.

The previous prime is 31313326127. The next prime is 31313326147. The reversal of 31313326133 is 33162331313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24655908484 + 6657417649 = 157022^2 + 81593^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31313326133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31313326096 and 31313326105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31313326123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656663066 + 15656663067.

It is an arithmetic number, because the mean of its divisors is an integer number (15656663067).

Almost surely, 2^31313326133 is an apocalyptic number.

It is an amenable number.

31313326133 is a deficient number, since it is larger than the sum of its proper divisors (1).

31313326133 is an equidigital number, since it uses as much as digits as its factorization.

31313326133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 29.

Adding to 31313326133 its reverse (33162331313), we get a palindrome (64475657446).

The spelling of 31313326133 in words is "thirty-one billion, three hundred thirteen million, three hundred twenty-six thousand, one hundred thirty-three".