321155 has 4 divisors (see below), whose sum is σ = 385392. Its totient is φ = 256920.

The previous prime is 321143. The next prime is 321163. The reversal of 321155 is 551123.

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

It is not a de Polignac number, because 321155 - 2⁶ = 321091 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 321155.

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, 32111 + ... + 32120.

It is an arithmetic number, because the mean of its divisors is an integer number (96348).

2³²¹¹⁵⁵ is an apocalyptic number.

321155 is a deficient number, since it is larger than the sum of its proper divisors (64237).

321155 is an equidigital number, since it uses as much as digits as its factorization.

321155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64236.

The product of its digits is 150, while the sum is 17.

The square root of 321155 is about 566.7053908337. The cubic root of 321155 is about 68.4812316493.

Adding to 321155 its reverse (551123), we get a palindrome (872278).

The spelling of 321155 in words is "three hundred twenty-one thousand, one hundred fifty-five".