99955 has 4 divisors (see below), whose sum is σ = 119952. Its totient is φ = 79960.

The previous prime is 99929. The next prime is 99961. The reversal of 99955 is 55999.

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: 55999 = 29 ⋅1931.

It is not a de Polignac number, because 99955 - 2⁵ = 99923 is a prime.

It is a Duffinian number.

99955 is a lucky number.

It is a nialpdrome in base 10.

It is a zygodrome in base 2 and base 10.

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, 9991 + ... + 10000.

It is an arithmetic number, because the mean of its divisors is an integer number (29988).

2⁹⁹⁹⁵⁵ is an apocalyptic number.

99955 is a deficient number, since it is larger than the sum of its proper divisors (19997).

99955 is a wasteful number, since it uses less digits than its factorization.

99955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19996.

The product of its digits is 18225, while the sum is 37.

The square root of 99955 is about 316.1566067632. The cubic root of 99955 is about 46.4089249083.

Subtracting from 99955 its reverse (55999), we obtain a triangular number (43956 = T₂₉₆).

It can be divided in two parts, 9995 and 5, that added together give a 4-th power (10000 = 10⁴).

The spelling of 99955 in words is "ninety-nine thousand, nine hundred fifty-five".