31131330233 has 2 divisors, whose sum is σ = 31131330234. Its totient is φ = 31131330232.

The previous prime is 31131330221. The next prime is 31131330259. The reversal of 31131330233 is 33203313113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29732794624 + 1398535609 = 172432^2 + 37397^2 .

It is an emirp because it is prime and its reverse (33203313113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31131330233 - 2²⁶ = 31064221369 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31131330199 and 31131330208.

It is not a weakly prime, because it can be changed into another prime (31131330283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15565665116 + 15565665117.

It is an arithmetic number, because the mean of its divisors is an integer number (15565665117).

Almost surely, 2^31131330233 is an apocalyptic number.

It is an amenable number.

31131330233 is a deficient number, since it is larger than the sum of its proper divisors (1).

31131330233 is an equidigital number, since it uses as much as digits as its factorization.

31131330233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 23.

Adding to 31131330233 its reverse (33203313113), we get a palindrome (64334643346).

The spelling of 31131330233 in words is "thirty-one billion, one hundred thirty-one million, three hundred thirty thousand, two hundred thirty-three".