391156 has 6 divisors (see below), whose sum is σ = 684530. Its totient is φ = 195576.

The previous prime is 391151. The next prime is 391159. The reversal of 391156 is 651193.

It can be written as a sum of positive squares in only one way, i.e., 336400 + 54756 = 580^2 + 234^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 391156.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 48891 + ... + 48898.

2³⁹¹¹⁵⁶ is an apocalyptic number.

It is an amenable number.

391156 is a deficient number, since it is larger than the sum of its proper divisors (293374).

391156 is a wasteful number, since it uses less digits than its factorization.

391156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97793 (or 97791 counting only the distinct ones).

The product of its digits is 810, while the sum is 25.

The square root of 391156 is about 625.4246557340. The cubic root of 391156 is about 73.1335517308.

The spelling of 391156 in words is "three hundred ninety-one thousand, one hundred fifty-six".