99999161 has 4 divisors (see below), whose sum is σ = 100023924. Its totient is φ = 99974400.

The previous prime is 99999157. The next prime is 99999167. The reversal of 99999161 is 16199999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62410000 + 37589161 = 7900^2 + 6131^2 .

It is a cyclic number.

It is not a de Polignac number, because 99999161 - 2² = 99999157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99999167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4760 + ... + 14921.

It is an arithmetic number, because the mean of its divisors is an integer number (25005981).

Almost surely, 2^99999161 is an apocalyptic number.

It is an amenable number.

99999161 is a deficient number, since it is larger than the sum of its proper divisors (24763).

99999161 is a wasteful number, since it uses less digits than its factorization.

99999161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24762.

The product of its digits is 354294, while the sum is 53.

The square root of 99999161 is about 9999.9580499120. The cubic root of 99999161 is about 464.1575852600.

The spelling of 99999161 in words is "ninety-nine million, nine hundred ninety-nine thousand, one hundred sixty-one".