99506181 has 4 divisors (see below), whose sum is σ = 132674912. Its totient is φ = 66337452.

The previous prime is 99506177. The next prime is 99506233. The reversal of 99506181 is 18160599.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 99506181 - 2² = 99506177 is a prime.

It is a super-2 number, since 2×99506181² = 19802960114409522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99506161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16584361 + ... + 16584366.

It is an arithmetic number, because the mean of its divisors is an integer number (33168728).

Almost surely, 2^99506181 is an apocalyptic number.

It is an amenable number.

99506181 is a deficient number, since it is larger than the sum of its proper divisors (33168731).

99506181 is a wasteful number, since it uses less digits than its factorization.

99506181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33168730.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 99506181 is about 9975.2784923530. The cubic root of 99506181 is about 463.3935873310.

The spelling of 99506181 in words is "ninety-nine million, five hundred six thousand, one hundred eighty-one".