99418181 has 2 divisors, whose sum is σ = 99418182. Its totient is φ = 99418180.

The previous prime is 99418169. The next prime is 99418199. The reversal of 99418181 is 18181499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87796900 + 11621281 = 9370^2 + 3409^2 .

It is a cyclic number.

It is not a de Polignac number, because 99418181 - 2⁶ = 99418117 is a prime.

It is a super-2 number, since 2×99418181² = 19767949426697522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99418141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49709090 + 49709091.

It is an arithmetic number, because the mean of its divisors is an integer number (49709091).

Almost surely, 2^99418181 is an apocalyptic number.

It is an amenable number.

99418181 is a deficient number, since it is larger than the sum of its proper divisors (1).

99418181 is an equidigital number, since it uses as much as digits as its factorization.

99418181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 41.

The square root of 99418181 is about 9970.8666122860. The cubic root of 99418181 is about 463.2569436831.

It can be divided in two parts, 99418 and 181, that added together give a palindrome (99599).

The spelling of 99418181 in words is "ninety-nine million, four hundred eighteen thousand, one hundred eighty-one".