31111221311 has 2 divisors, whose sum is σ = 31111221312. Its totient is φ = 31111221310.

The previous prime is 31111221289. The next prime is 31111221353. The reversal of 31111221311 is 11312211113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31111221311 - 2¹⁸ = 31110959167 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31111221311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31111221371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555610655 + 15555610656.

It is an arithmetic number, because the mean of its divisors is an integer number (15555610656).

Almost surely, 2^31111221311 is an apocalyptic number.

31111221311 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111221311 is an equidigital number, since it uses as much as digits as its factorization.

31111221311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 17.

Adding to 31111221311 its reverse (11312211113), we get a palindrome (42423432424).

The spelling of 31111221311 in words is "thirty-one billion, one hundred eleven million, two hundred twenty-one thousand, three hundred eleven".