99101 has 4 divisors (see below), whose sum is σ = 100092. Its totient is φ = 98112.

The previous prime is 99089. The next prime is 99103. The reversal of 99101 is 10199.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 36100 + 63001 = 190^2 + 251^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326 + ... + 551.

It is an arithmetic number, because the mean of its divisors is an integer number (25023).

2⁹⁹¹⁰¹ is an apocalyptic number.

It is an amenable number.

99101 is a deficient number, since it is larger than the sum of its proper divisors (991).

99101 is a wasteful number, since it uses less digits than its factorization.

99101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 99101 is about 314.8031130723. The cubic root of 99101 is about 46.2763764812.

It can be divided in two parts, 99 and 101, that multiplied together give a palindrome (9999).

The spelling of 99101 in words is "ninety-nine thousand, one hundred one".