123011331311 has 4 divisors (see below), whose sum is σ = 134194179624. Its totient is φ = 111828483000.

The previous prime is 123011331281. The next prime is 123011331337. The reversal of 123011331311 is 113133110321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123011331311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123019331311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5591424140 + ... + 5591424161.

It is an arithmetic number, because the mean of its divisors is an integer number (33548544906).

Almost surely, 2^123011331311 is an apocalyptic number.

123011331311 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123011331311 is a deficient number, since it is larger than the sum of its proper divisors (11182848313).

123011331311 is a wasteful number, since it uses less digits than its factorization.

123011331311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11182848312.

The product of its (nonzero) digits is 162, while the sum is 20.

Adding to 123011331311 its reverse (113133110321), we get a palindrome (236144441632).

The spelling of 123011331311 in words is "one hundred twenty-three billion, eleven million, three hundred thirty-one thousand, three hundred eleven".