123521112 has 320 divisors, whose sum is σ = 429327360. Its totient is φ = 32659200.

The previous prime is 123521093. The next prime is 123521117. The reversal of 123521112 is 211125321.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123521117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2872563 + ... + 2872605.

It is an arithmetic number, because the mean of its divisors is an integer number (1341648).

Almost surely, 2^123521112 is an apocalyptic number.

123521112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123521112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214663680).

123521112 is an abundant number, since it is smaller than the sum of its proper divisors (305806248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123521112 is a wasteful number, since it uses less digits than its factorization.

123521112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 103 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 123521112 is about 11114.0052186419. The cubic root of 123521112 is about 498.0203214236.

Adding to 123521112 its reverse (211125321), we get a palindrome (334646433).

The spelling of 123521112 in words is "one hundred twenty-three million, five hundred twenty-one thousand, one hundred twelve".