391155 has 16 divisors (see below), whose sum is σ = 635040. Its totient is φ = 205568.

The previous prime is 391151. The next prime is 391159. The reversal of 391155 is 551193.

It is an interprime number because it is at equal distance from previous prime (391151) and next prime (391159).

It is a cyclic number.

It is not a de Polignac number, because 391155 - 2² = 391151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (391151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1189 + ... + 1481.

It is an arithmetic number, because the mean of its divisors is an integer number (39690).

2³⁹¹¹⁵⁵ is an apocalyptic number.

391155 is a deficient number, since it is larger than the sum of its proper divisors (243885).

391155 is a wasteful number, since it uses less digits than its factorization.

391155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390.

The product of its digits is 675, while the sum is 24.

The square root of 391155 is about 625.4238562767. The cubic root of 391155 is about 73.1334894081.

The spelling of 391155 in words is "three hundred ninety-one thousand, one hundred fifty-five".