155311 has 6 divisors (see below), whose sum is σ = 168360. Its totient is φ = 143208.

The previous prime is 155303. The next prime is 155317. The reversal of 155311 is 113551.

It is not a de Polignac number, because 155311 - 2³ = 155303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 291 + ... + 628.

It is an arithmetic number, because the mean of its divisors is an integer number (28060).

2¹⁵⁵³¹¹ is an apocalyptic number.

155311 is a deficient number, since it is larger than the sum of its proper divisors (13049).

155311 is an equidigital number, since it uses as much as digits as its factorization.

155311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945 (or 932 counting only the distinct ones).

The product of its digits is 75, while the sum is 16.

The square root of 155311 is about 394.0951661718. The cubic root of 155311 is about 53.7527563036.

Subtracting from 155311 its product of digits (75), we obtain a square (155236 = 394²).

Adding to 155311 its reverse (113551), we get a palindrome (268862).

It can be divided in two parts, 155 and 311, that multiplied together give a triangular number (48205 = T₃₁₀).

The spelling of 155311 in words is "one hundred fifty-five thousand, three hundred eleven".