100018081 has 2 divisors, whose sum is σ = 100018082. Its totient is φ = 100018080.

The previous prime is 100018057. The next prime is 100018091. The reversal of 100018081 is 180810001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91374481 + 8643600 = 9559^2 + 2940^2 .

It is a cyclic number.

It is not a de Polignac number, because 100018081 - 2⁹ = 100017569 is a prime.

It is a super-2 number, since 2×100018081² = 20007233053845122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100018001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50009040 + 50009041.

It is an arithmetic number, because the mean of its divisors is an integer number (50009041).

Almost surely, 2^100018081 is an apocalyptic number.

It is an amenable number.

100018081 is a deficient number, since it is larger than the sum of its proper divisors (1).

100018081 is an equidigital number, since it uses as much as digits as its factorization.

100018081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

The square root of 100018081 is about 10000.9040091384. The cubic root of 100018081 is about 464.1868565313.

Adding to 100018081 its reverse (180810001), we get a palindrome (280828082).

The spelling of 100018081 in words is "one hundred million, eighteen thousand, eighty-one".