100118281 has 4 divisors (see below), whose sum is σ = 100138500. Its totient is φ = 100098064.

The previous prime is 100118267. The next prime is 100118309. The reversal of 100118281 is 182811001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75951225 + 24167056 = 8715^2 + 4916^2 .

It is a cyclic number.

It is not a de Polignac number, because 100118281 - 2¹⁹ = 99593993 is a prime.

It is a super-2 number, since 2×100118281² = 20047340380789922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100118231) 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, 2895 + ... + 14443.

It is an arithmetic number, because the mean of its divisors is an integer number (25034625).

Almost surely, 2^100118281 is an apocalyptic number.

It is an amenable number.

100118281 is a deficient number, since it is larger than the sum of its proper divisors (20219).

100118281 is an equidigital number, since it uses as much as digits as its factorization.

100118281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20218.

The product of its (nonzero) digits is 128, while the sum is 22.

The square root of 100118281 is about 10005.9123022341. The cubic root of 100118281 is about 464.3418151786.

Adding to 100118281 its reverse (182811001), we get a palindrome (282929282).

It can be divided in two parts, 1001 and 18281, that multiplied together give a palindrome (18299281).

The spelling of 100118281 in words is "one hundred million, one hundred eighteen thousand, two hundred eighty-one".