31111121321239 has 2 divisors, whose sum is σ = 31111121321240. Its totient is φ = 31111121321238.

The previous prime is 31111121321213. The next prime is 31111121321261. The reversal of 31111121321239 is 93212312111113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31111121321239 - 2¹¹ = 31111121319191 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31111121321239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31111121321339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555560660619 + 15555560660620.

It is an arithmetic number, because the mean of its divisors is an integer number (15555560660620).

Almost surely, 2^{31111121321239} is an apocalyptic number.

31111121321239 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111121321239 is an equidigital number, since it uses as much as digits as its factorization.

31111121321239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 31.

The spelling of 31111121321239 in words is "thirty-one trillion, one hundred eleven billion, one hundred twenty-one million, three hundred twenty-one thousand, two hundred thirty-nine".