100718981 has 8 divisors (see below), whose sum is σ = 115658400. Its totient is φ = 86743440.

The previous prime is 100718953. The next prime is 100719007. The reversal of 100718981 is 189817001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100718981 is a prime.

It is a super-2 number, since 2×100718981² = 20288626267356722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100718941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240746 + ... + 241163.

It is an arithmetic number, because the mean of its divisors is an integer number (14457300).

Almost surely, 2^100718981 is an apocalyptic number.

100718981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100718981 is a deficient number, since it is larger than the sum of its proper divisors (14939419).

100718981 is a wasteful number, since it uses less digits than its factorization.

100718981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481939.

The product of its (nonzero) digits is 4032, while the sum is 35.

The square root of 100718981 is about 10035.8846645425. The cubic root of 100718981 is about 465.2686326936.

The spelling of 100718981 in words is "one hundred million, seven hundred eighteen thousand, nine hundred eighty-one".