99181955 has 4 divisors (see below), whose sum is σ = 119018352. Its totient is φ = 79345560.

The previous prime is 99181939. The next prime is 99181963. The reversal of 99181955 is 55918199.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 99181955 - 2⁴ = 99181939 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9918191 + ... + 9918200.

It is an arithmetic number, because the mean of its divisors is an integer number (29754588).

Almost surely, 2^99181955 is an apocalyptic number.

99181955 is a deficient number, since it is larger than the sum of its proper divisors (19836397).

99181955 is a wasteful number, since it uses less digits than its factorization.

99181955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19836396.

The product of its digits is 145800, while the sum is 47.

The square root of 99181955 is about 9959.0137563917. The cubic root of 99181955 is about 462.8897401442.

The spelling of 99181955 in words is "ninety-nine million, one hundred eighty-one thousand, nine hundred fifty-five".