99828181 has 2 divisors, whose sum is σ = 99828182. Its totient is φ = 99828180.

The previous prime is 99828163. The next prime is 99828247. The reversal of 99828181 is 18182899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99820081 + 8100 = 9991^2 + 90^2 .

It is a cyclic number.

It is not a de Polignac number, because 99828181 - 2¹⁷ = 99697109 is a prime.

It is a super-2 number, since 2×99828181² = 19931331443537522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99828101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49914090 + 49914091.

It is an arithmetic number, because the mean of its divisors is an integer number (49914091).

Almost surely, 2^99828181 is an apocalyptic number.

It is an amenable number.

99828181 is a deficient number, since it is larger than the sum of its proper divisors (1).

99828181 is an equidigital number, since it uses as much as digits as its factorization.

99828181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 46.

The square root of 99828181 is about 9991.4053566052. The cubic root of 99828181 is about 463.8928932453.

The spelling of 99828181 in words is "ninety-nine million, eight hundred twenty-eight thousand, one hundred eighty-one".