123171533911 has 4 divisors (see below), whose sum is σ = 126035988232. Its totient is φ = 120307079592.

The previous prime is 123171533893. The next prime is 123171533981. The reversal of 123171533911 is 119335171321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 119335171321 = 5351 ⋅22301471.

It is a cyclic number.

It is not a de Polignac number, because 123171533911 - 2⁵ = 123171533879 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 (123171533981) 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, 1432227096 + ... + 1432227181.

It is an arithmetic number, because the mean of its divisors is an integer number (31508997058).

Almost surely, 2^123171533911 is an apocalyptic number.

123171533911 is a deficient number, since it is larger than the sum of its proper divisors (2864454321).

123171533911 is an equidigital number, since it uses as much as digits as its factorization.

123171533911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2864454320.

The product of its digits is 17010, while the sum is 37.

The spelling of 123171533911 in words is "one hundred twenty-three billion, one hundred seventy-one million, five hundred thirty-three thousand, nine hundred eleven".