3155 has 4 divisors (see below), whose sum is σ = 3792. Its totient is φ = 2520.

The previous prime is 3137. The next prime is 3163. The reversal of 3155 is 5513.

3155 = T₃₃ + T₃₄ + ... + T₃₇.

3155 is nontrivially palindromic in base 4.

3155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5513 = 37 ⋅149.

It is not a de Polignac number, because 3155 - 2¹⁰ = 2131 is a prime.

It is a Duffinian number.

It is a plaindrome in base 6, base 12 and base 13.

It is a nialpdrome in base 16.

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, 311 + ... + 320.

It is an arithmetic number, because the mean of its divisors is an integer number (948).

2³¹⁵⁵ is an apocalyptic number.

3155 is a deficient number, since it is larger than the sum of its proper divisors (637).

3155 is an equidigital number, since it uses as much as digits as its factorization.

3155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636.

The product of its digits is 75, while the sum is 14.

The square root of 3155 is about 56.1693866799. The cubic root of 3155 is about 14.6667240585. Note that the first 3 decimals are identical.

Adding to 3155 its reverse (5513), we get a palindrome (8668).

It can be divided in two parts, 3 and 155, that multiplied together give a triangular number (465 = T₃₀).

The spelling of 3155 in words is "three thousand, one hundred fifty-five".