100231128 has 32 divisors (see below), whose sum is σ = 278420400. Its totient is φ = 33410304.

The previous prime is 100231121. The next prime is 100231139. The reversal of 100231128 is 821132001.

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

It is a self number, because there is not a number n which added to its sum of digits gives 100231128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100231121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231801 + ... + 232232.

Almost surely, 2^100231128 is an apocalyptic number.

100231128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

100231128 is an abundant number, since it is smaller than the sum of its proper divisors (178189272).

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

100231128 is a wasteful number, since it uses less digits than its factorization.

100231128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464048 (or 464038 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 100231128 is about 10011.5497301866. The cubic root of 100231128 is about 464.5162085909.

Adding to 100231128 its reverse (821132001), we get a palindrome (921363129).

The spelling of 100231128 in words is "one hundred million, two hundred thirty-one thousand, one hundred twenty-eight".