99181901 has 16 divisors (see below), whose sum is σ = 122304000. Its totient is φ = 78323328.

The previous prime is 99181889. The next prime is 99181903. The reversal of 99181901 is 10918199.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 99181901 - 2⁶ = 99181837 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99181903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94025 + ... + 95073.

It is an arithmetic number, because the mean of its divisors is an integer number (7644000).

Almost surely, 2^99181901 is an apocalyptic number.

99181901 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

99181901 is a deficient number, since it is larger than the sum of its proper divisors (23122099).

99181901 is a wasteful number, since it uses less digits than its factorization.

99181901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108.

The product of its (nonzero) digits is 5832, while the sum is 38.

The square root of 99181901 is about 9959.0110452795. The cubic root of 99181901 is about 462.8896561369.

The spelling of 99181901 in words is "ninety-nine million, one hundred eighty-one thousand, nine hundred one".