100500381 has 12 divisors (see below), whose sum is σ = 145567552. Its totient is φ = 66815496.

The previous prime is 100500377. The next prime is 100500401. The reversal of 100500381 is 183005001.

It is a happy number.

It is not a de Polignac number, because 100500381 - 2² = 100500377 is a prime.

It is a super-2 number, since 2×100500381² = 20200653162290322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100500181) 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 11 ways as a sum of consecutive naturals, for example, 11911 + ... + 18516.

Almost surely, 2^100500381 is an apocalyptic number.

It is an amenable number.

100500381 is a deficient number, since it is larger than the sum of its proper divisors (45067171).

100500381 is a wasteful number, since it uses less digits than its factorization.

100500381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30800 (or 30797 counting only the distinct ones).

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

The square root of 100500381 is about 10024.9878304166. The cubic root of 100500381 is about 464.9317832638.

Adding to 100500381 its reverse (183005001), we get a palindrome (283505382).

The spelling of 100500381 in words is "one hundred million, five hundred thousand, three hundred eighty-one".