31133021233 has 2 divisors, whose sum is σ = 31133021234. Its totient is φ = 31133021232.

The previous prime is 31133021189. The next prime is 31133021243. The reversal of 31133021233 is 33212033113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15854083569 + 15278937664 = 125913^2 + 123608^2 .

It is a cyclic number.

It is not a de Polignac number, because 31133021233 - 2³³ = 22543086641 is a prime.

It is a super-2 number, since 2×31133021233² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31133021243) 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 as a sum of consecutive naturals, namely, 15566510616 + 15566510617.

It is an arithmetic number, because the mean of its divisors is an integer number (15566510617).

Almost surely, 2^31133021233 is an apocalyptic number.

It is an amenable number.

31133021233 is a deficient number, since it is larger than the sum of its proper divisors (1).

31133021233 is an equidigital number, since it uses as much as digits as its factorization.

31133021233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31133021233 its reverse (33212033113), we get a palindrome (64345054346).

The spelling of 31133021233 in words is "thirty-one billion, one hundred thirty-three million, twenty-one thousand, two hundred thirty-three".