100531044 has 72 divisors (see below), whose sum is σ = 268151520. Its totient is φ = 32923584.

The previous prime is 100531043. The next prime is 100531049. The reversal of 100531044 is 440135001.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (100531043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56472 + ... + 58224.

Almost surely, 2^100531044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 100531044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134075760).

100531044 is an abundant number, since it is smaller than the sum of its proper divisors (167620476).

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

100531044 is a wasteful number, since it uses less digits than its factorization.

100531044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831 (or 1817 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 100531044 is about 10026.5170423233. The cubic root of 100531044 is about 464.9790625328.

Adding to 100531044 its reverse (440135001), we get a palindrome (540666045).

The spelling of 100531044 in words is "one hundred million, five hundred thirty-one thousand, forty-four".