99904171 has 4 divisors (see below), whose sum is σ = 101311344. Its totient is φ = 98497000.

The previous prime is 99904163. The next prime is 99904183. The reversal of 99904171 is 17140999.

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: 17140999 = 443 ⋅38693.

It is a cyclic number.

It is not a de Polignac number, because 99904171 - 2³ = 99904163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99904271) 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, 703480 + ... + 703621.

It is an arithmetic number, because the mean of its divisors is an integer number (25327836).

Almost surely, 2^99904171 is an apocalyptic number.

99904171 is a deficient number, since it is larger than the sum of its proper divisors (1407173).

99904171 is a wasteful number, since it uses less digits than its factorization.

99904171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407172.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 99904171 is about 9995.2074015500. The cubic root of 99904171 is about 464.0105697032.

It can be divided in two parts, 9990 and 4171, that added together give a square (14161 = 119²).

The spelling of 99904171 in words is "ninety-nine million, nine hundred four thousand, one hundred seventy-one".