99173381 has 2 divisors, whose sum is σ = 99173382. Its totient is φ = 99173380.

The previous prime is 99173353. The next prime is 99173387. The reversal of 99173381 is 18337199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66569281 + 32604100 = 8159^2 + 5710^2 .

It is a cyclic number.

It is not a de Polignac number, because 99173381 - 2⁶ = 99173317 is a prime.

It is a super-2 number, since 2×99173381² = 19670718997942322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99173387) 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, 49586690 + 49586691.

It is an arithmetic number, because the mean of its divisors is an integer number (49586691).

Almost surely, 2^99173381 is an apocalyptic number.

It is an amenable number.

99173381 is a deficient number, since it is larger than the sum of its proper divisors (1).

99173381 is an equidigital number, since it uses as much as digits as its factorization.

99173381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 99173381 is about 9958.5832827767. The cubic root of 99173381 is about 462.8764012561.

The spelling of 99173381 in words is "ninety-nine million, one hundred seventy-three thousand, three hundred eighty-one".