31121331233 has 2 divisors, whose sum is σ = 31121331234. Its totient is φ = 31121331232.

The previous prime is 31121331223. The next prime is 31121331247. The reversal of 31121331233 is 33213312113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29370076129 + 1751255104 = 171377^2 + 41848^2 .

It is a cyclic number.

It is not a de Polignac number, because 31121331233 - 2⁶ = 31121331169 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31121331199 and 31121331208.

It is not a weakly prime, because it can be changed into another prime (31121331223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560665616 + 15560665617.

It is an arithmetic number, because the mean of its divisors is an integer number (15560665617).

Almost surely, 2^31121331233 is an apocalyptic number.

It is an amenable number.

31121331233 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121331233 is an equidigital number, since it uses as much as digits as its factorization.

31121331233 is an evil number, because the sum of its binary digits is even.

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

Adding to 31121331233 its reverse (33213312113), we get a palindrome (64334643346).

The spelling of 31121331233 in words is "thirty-one billion, one hundred twenty-one million, three hundred thirty-one thousand, two hundred thirty-three".