1311211123 has 8 divisors (see below), whose sum is σ = 1382307840. Its totient is φ = 1241914440.

The previous prime is 1311211079. The next prime is 1311211157. The reversal of 1311211123 is 3211121131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311211123 - 2¹⁷ = 1311080051 is a prime.

It is a super-2 number, since 2×1311211123² = 3438549218157842258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311211097 and 1311211106.

It is not an unprimeable number, because it can be changed into a prime (1311211523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448513 + ... + 451426.

It is an arithmetic number, because the mean of its divisors is an integer number (172788480).

Almost surely, 2^1311211123 is an apocalyptic number.

1311211123 is a deficient number, since it is larger than the sum of its proper divisors (71096717).

1311211123 is an equidigital number, since it uses as much as digits as its factorization.

1311211123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900017.

The product of its digits is 36, while the sum is 16.

The square root of 1311211123 is about 36210.6493037615. The cubic root of 1311211123 is about 1094.5212763886.

Adding to 1311211123 its reverse (3211121131), we get a palindrome (4522332254).

The spelling of 1311211123 in words is "one billion, three hundred eleven million, two hundred eleven thousand, one hundred twenty-three".