31121234533 has 2 divisors, whose sum is σ = 31121234534. Its totient is φ = 31121234532.

The previous prime is 31121234531. The next prime is 31121234579. The reversal of 31121234533 is 33543212113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18162144289 + 12959090244 = 134767^2 + 113838^2 .

It is an emirp because it is prime and its reverse (33543212113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31121234533 - 2¹ = 31121234531 is a prime.

Together with 31121234531, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31121234531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560617266 + 15560617267.

It is an arithmetic number, because the mean of its divisors is an integer number (15560617267).

Almost surely, 2^31121234533 is an apocalyptic number.

It is an amenable number.

31121234533 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121234533 is an equidigital number, since it uses as much as digits as its factorization.

31121234533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 28.

Adding to 31121234533 its reverse (33543212113), we get a palindrome (64664446646).

The spelling of 31121234533 in words is "thirty-one billion, one hundred twenty-one million, two hundred thirty-four thousand, five hundred thirty-three".