31310121289 has 2 divisors, whose sum is σ = 31310121290. Its totient is φ = 31310121288.

The previous prime is 31310121287. The next prime is 31310121343. The reversal of 31310121289 is 98212101313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27136961289 + 4173160000 = 164733^2 + 64600^2 .

It is an emirp because it is prime and its reverse (98212101313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31310121289 - 2¹ = 31310121287 is a prime.

Together with 31310121287, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 31310121289.

It is not a weakly prime, because it can be changed into another prime (31310121287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655060644 + 15655060645.

It is an arithmetic number, because the mean of its divisors is an integer number (15655060645).

Almost surely, 2^31310121289 is an apocalyptic number.

It is an amenable number.

31310121289 is a deficient number, since it is larger than the sum of its proper divisors (1).

31310121289 is an equidigital number, since it uses as much as digits as its factorization.

31310121289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 31.

The spelling of 31310121289 in words is "thirty-one billion, three hundred ten million, one hundred twenty-one thousand, two hundred eighty-nine".