311212111123 has 2 divisors, whose sum is σ = 311212111124. Its totient is φ = 311212111122.

The previous prime is 311212111099. The next prime is 311212111159. The reversal of 311212111123 is 321111212113.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311212111123 is a prime.

It is a super-2 number, since 2×311212111123² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 311212111123.

It is not a weakly prime, because it can be changed into another prime (311212111723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155606055561 + 155606055562.

It is an arithmetic number, because the mean of its divisors is an integer number (155606055562).

Almost surely, 2^311212111123 is an apocalyptic number.

311212111123 is a deficient number, since it is larger than the sum of its proper divisors (1).

311212111123 is an equidigital number, since it uses as much as digits as its factorization.

311212111123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 19.

Adding to 311212111123 its reverse (321111212113), we get a palindrome (632323323236).

The spelling of 311212111123 in words is "three hundred eleven billion, two hundred twelve million, one hundred eleven thousand, one hundred twenty-three".