99998771 has 4 divisors (see below), whose sum is σ = 100263000. Its totient is φ = 99734544.

The previous prime is 99998749. The next prime is 99998783. The reversal of 99998771 is 17789999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17789999 = 109 ⋅163211.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99998771 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99998771.

It is not an unprimeable number, because it can be changed into a prime (99998071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131546 + ... + 132303.

It is an arithmetic number, because the mean of its divisors is an integer number (25065750).

Almost surely, 2^99998771 is an apocalyptic number.

99998771 is a deficient number, since it is larger than the sum of its proper divisors (264229).

99998771 is a wasteful number, since it uses less digits than its factorization.

99998771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264228.

The product of its digits is 2571912, while the sum is 59.

The square root of 99998771 is about 9999.9385498112. The cubic root of 99998771 is about 464.1569818493.

The spelling of 99998771 in words is "ninety-nine million, nine hundred ninety-eight thousand, seven hundred seventy-one".