99042181 has 12 divisors (see below), whose sum is σ = 115644108. Its totient is φ = 84575232.

The previous prime is 99042173. The next prime is 99042197. The reversal of 99042181 is 18124099.

It can be written as a sum of positive squares in 2 ways, for example, as 24910081 + 74132100 = 4991^2 + 8610^2 .

It is not a de Polignac number, because 99042181 - 2³ = 99042173 is a prime.

It is a super-2 number, since 2×99042181² = 19618707234473522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99042121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9925 + ... + 17221.

It is an arithmetic number, because the mean of its divisors is an integer number (9637009).

Almost surely, 2^99042181 is an apocalyptic number.

It is an amenable number.

99042181 is a deficient number, since it is larger than the sum of its proper divisors (16601927).

99042181 is a wasteful number, since it uses less digits than its factorization.

99042181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7588 (or 7581 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 99042181 is about 9951.9938203357. The cubic root of 99042181 is about 462.6721926157.

The spelling of 99042181 in words is "ninety-nine million, forty-two thousand, one hundred eighty-one".