100013128 has 8 divisors (see below), whose sum is σ = 187524630. Its totient is φ = 50006560.

The previous prime is 100013113. The next prime is 100013143. The reversal of 100013128 is 821310001.

It is an interprime number because it is at equal distance from previous prime (100013113) and next prime (100013143).

It can be written as a sum of positive squares in only one way, i.e., 71944324 + 28068804 = 8482^2 + 5298^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6250813 + ... + 6250828.

Almost surely, 2^100013128 is an apocalyptic number.

It is an amenable number.

100013128 is a deficient number, since it is larger than the sum of its proper divisors (87511502).

100013128 is a wasteful number, since it uses less digits than its factorization.

100013128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12501647 (or 12501643 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 100013128 is about 10000.6563784584. The cubic root of 100013128 is about 464.1791940652.

Adding to 100013128 its reverse (821310001), we get a palindrome (921323129).

The spelling of 100013128 in words is "one hundred million, thirteen thousand, one hundred twenty-eight".