155531112 has 128 divisors (see below), whose sum is σ = 452390400. Its totient is φ = 44064000.

The previous prime is 155531111. The next prime is 155531137. The reversal of 155531112 is 211135551.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (155531111) 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 31 ways as a sum of consecutive naturals, for example, 506463 + ... + 506769.

It is an arithmetic number, because the mean of its divisors is an integer number (3534300).

Almost surely, 2^155531112 is an apocalyptic number.

155531112 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 155531112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226195200).

155531112 is an abundant number, since it is smaller than the sum of its proper divisors (296859288).

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

155531112 is a wasteful number, since it uses less digits than its factorization.

155531112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 443 counting only the distinct ones).

The product of its digits is 750, while the sum is 24.

The square root of 155531112 is about 12471.2113284957. The cubic root of 155531112 is about 537.7813772472.

Adding to 155531112 its reverse (211135551), we get a palindrome (366666663).

The spelling of 155531112 in words is "one hundred fifty-five million, five hundred thirty-one thousand, one hundred twelve".