831381 has 8 divisors (see below), whose sum is σ = 1156800. Its totient is φ = 530112.

The previous prime is 831373. The next prime is 831407. The reversal of 831381 is 183138.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 831381 - 2³ = 831373 is a prime.

It is a super-2 number, since 2×831381² = 1382388734322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 831381.

It is not an unprimeable number, because it can be changed into a prime (831301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5956 + ... + 6093.

It is an arithmetic number, because the mean of its divisors is an integer number (144600).

2⁸³¹³⁸¹ is an apocalyptic number.

It is an amenable number.

831381 is a deficient number, since it is larger than the sum of its proper divisors (325419).

831381 is a wasteful number, since it uses less digits than its factorization.

831381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12075.

The product of its digits is 576, while the sum is 24.

The square root of 831381 is about 911.8009651234. The cubic root of 831381 is about 94.0300567833.

Adding to 831381 its sum of digits (24), we get a triangular number (831405 = T₁₂₈₉).

The spelling of 831381 in words is "eight hundred thirty-one thousand, three hundred eighty-one".