123143111531 has 8 divisors (see below), whose sum is σ = 142240171824. Its totient is φ = 105363089920.

The previous prime is 123143111527. The next prime is 123143111549. The reversal of 123143111531 is 135111341321.

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

It is not a de Polignac number, because 123143111531 - 2² = 123143111527 is a prime.

It is a super-3 number, since 3×123143111531³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123143111531.

It is not an unprimeable number, because it can be changed into a prime (123143111561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329259470 + ... + 329259843.

It is an arithmetic number, because the mean of its divisors is an integer number (17780021478).

Almost surely, 2^123143111531 is an apocalyptic number.

123143111531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123143111531 is a deficient number, since it is larger than the sum of its proper divisors (19097060293).

123143111531 is a wasteful number, since it uses less digits than its factorization.

123143111531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658519341.

The product of its digits is 1080, while the sum is 26.

Adding to 123143111531 its reverse (135111341321), we get a palindrome (258254452852).

The spelling of 123143111531 in words is "one hundred twenty-three billion, one hundred forty-three million, one hundred eleven thousand, five hundred thirty-one".