99673181 has 2 divisors, whose sum is σ = 99673182. Its totient is φ = 99673180.

The previous prime is 99673141. The next prime is 99673199. The reversal of 99673181 is 18137699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64080025 + 35593156 = 8005^2 + 5966^2 .

It is an emirp because it is prime and its reverse (18137699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99673181 - 2²⁶ = 32564317 is a prime.

It is a super-2 number, since 2×99673181² = 19869486021317522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99673111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49836590 + 49836591.

It is an arithmetic number, because the mean of its divisors is an integer number (49836591).

Almost surely, 2^99673181 is an apocalyptic number.

It is an amenable number.

99673181 is a deficient number, since it is larger than the sum of its proper divisors (1).

99673181 is an equidigital number, since it uses as much as digits as its factorization.

99673181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 44.

The square root of 99673181 is about 9983.6456768056. The cubic root of 99673181 is about 463.6526783617.

The spelling of 99673181 in words is "ninety-nine million, six hundred seventy-three thousand, one hundred eighty-one".