1311111020123 has 2 divisors, whose sum is σ = 1311111020124. Its totient is φ = 1311111020122.

The previous prime is 1311111020113. The next prime is 1311111020137. The reversal of 1311111020123 is 3210201111131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311111020123 - 2¹² = 1311111016027 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311111020113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655555510061 + 655555510062.

It is an arithmetic number, because the mean of its divisors is an integer number (655555510062).

Almost surely, 2^{1311111020123} is an apocalyptic number.

1311111020123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311111020123 is an equidigital number, since it uses as much as digits as its factorization.

1311111020123 is an odious number, because the sum of its binary digits is odd.

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

Adding to 1311111020123 its reverse (3210201111131), we get a palindrome (4521312131254).

The spelling of 1311111020123 in words is "one trillion, three hundred eleven billion, one hundred eleven million, twenty thousand, one hundred twenty-three".