9955 has 8 divisors (see below), whose sum is σ = 13104. Its totient is φ = 7200.

The previous prime is 9949. The next prime is 9967. The reversal of 9955 is 5599.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9955 - 2⁵ = 9923 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10 and base 11.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36 + ... + 145.

It is an arithmetic number, because the mean of its divisors is an integer number (1638).

2⁹⁹⁵⁵ is an apocalyptic number.

9955 is a deficient number, since it is larger than the sum of its proper divisors (3149).

9955 is a wasteful number, since it uses less digits than its factorization.

9955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197.

The product of its digits is 2025, while the sum is 28.

The square root of 9955 is about 99.7747463039. The cubic root of 9955 is about 21.5119817836.

Subtracting from 9955 its reverse (5599), we obtain a square (4356 = 66²).

It can be divided in two parts, 995 and 5, that added together give a cube (1000 = 10³).

The spelling of 9955 in words is "nine thousand, nine hundred fifty-five".