391131 has 12 divisors (see below), whose sum is σ = 608608. Its totient is φ = 240624.

The previous prime is 391117. The next prime is 391133. The reversal of 391131 is 131193.

It is not a de Polignac number, because 391131 - 2⁶ = 391067 is a prime.

It is a super-2 number, since 2×391131² = 305966918322, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (391133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1555 + ... + 1788.

2³⁹¹¹³¹ is an apocalyptic number.

391131 is a deficient number, since it is larger than the sum of its proper divisors (217477).

391131 is a wasteful number, since it uses less digits than its factorization.

391131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3362 (or 3359 counting only the distinct ones).

The product of its digits is 81, while the sum is 18.

The square root of 391131 is about 625.4046689944. The cubic root of 391131 is about 73.1319936331.

The spelling of 391131 in words is "three hundred ninety-one thousand, one hundred thirty-one".