99550081 has 4 divisors (see below), whose sum is σ = 99786964. Its totient is φ = 99313200.

The previous prime is 99550067. The next prime is 99550123. The reversal of 99550081 is 18005599.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18005599 = 547 ⋅32917.

It can be written as a sum of positive squares in 2 ways, for example, as 3686400 + 95863681 = 1920^2 + 9791^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99550081 is a prime.

It is a super-2 number, since 2×99550081² = 19820437254213122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99550081.

It is not an unprimeable number, because it can be changed into a prime (99580081) 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, 117810 + ... + 118651.

It is an arithmetic number, because the mean of its divisors is an integer number (24946741).

Almost surely, 2^99550081 is an apocalyptic number.

99550081 is the 5761-st hex number.

It is an amenable number.

99550081 is a deficient number, since it is larger than the sum of its proper divisors (236883).

99550081 is a wasteful number, since it uses less digits than its factorization.

99550081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236882.

The product of its (nonzero) digits is 16200, while the sum is 37.

The square root of 99550081 is about 9977.4786895287. The cubic root of 99550081 is about 463.4617237602.

It can be divided in two parts, 995 and 50081, that added together give a square (51076 = 226²).

The spelling of 99550081 in words is "ninety-nine million, five hundred fifty thousand, eighty-one".