231381 has 12 divisors (see below), whose sum is σ = 341952. Its totient is φ = 150696.

The previous prime is 231379. The next prime is 231409. The reversal of 231381 is 183132.

231381 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231381 - 2¹ = 231379 is a prime.

It is a super-2 number, since 2×231381² = 107074334322, which contains 22 as substring.

231381 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150 + ... + 696.

It is an arithmetic number, because the mean of its divisors is an integer number (28496).

2²³¹³⁸¹ is an apocalyptic number.

It is an amenable number.

231381 is a deficient number, since it is larger than the sum of its proper divisors (110571).

231381 is a wasteful number, since it uses less digits than its factorization.

231381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600 (or 597 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 231381 is about 481.0207895715. The cubic root of 231381 is about 61.3916394449.

The spelling of 231381 in words is "two hundred thirty-one thousand, three hundred eighty-one".