100000981 has 4 divisors (see below), whose sum is σ = 100101100. Its totient is φ = 99900864.

The previous prime is 100000969. The next prime is 100001029. The reversal of 100000981 is 189000001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189000001 = 13451 ⋅14051.

It can be written as a sum of positive squares in 2 ways, for example, as 54316900 + 45684081 = 7370^2 + 6759^2 .

It is a cyclic number.

It is not a de Polignac number, because 100000981 - 2⁷ = 100000853 is a prime.

It is a super-2 number, since 2×100000981² = 20000392401924722, 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 (100000921) 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 3 ways as a sum of consecutive naturals, for example, 48546 + ... + 50563.

It is an arithmetic number, because the mean of its divisors is an integer number (25025275).

Almost surely, 2^100000981 is an apocalyptic number.

It is an amenable number.

100000981 is a deficient number, since it is larger than the sum of its proper divisors (100119).

100000981 is an equidigital number, since it uses as much as digits as its factorization.

100000981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100118.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 100000981 is about 10000.0490498797. The cubic root of 100000981 is about 464.1604011559.

Adding to 100000981 its reverse (189000001), we get a palindrome (289000982).

The spelling of 100000981 in words is "one hundred million, nine hundred eighty-one", and thus it is an aban number.