231181 has 4 divisors (see below), whose sum is σ = 232864. Its totient is φ = 229500.

The previous prime is 231169. The next prime is 231197. The reversal of 231181 is 181132.

231181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231181 - 2⁷ = 231053 is a prime.

It is a super-2 number, since 2×231181² = 106889309522, which contains 22 as substring.

It is a Duffinian number.

231181 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 615 + ... + 916.

It is an arithmetic number, because the mean of its divisors is an integer number (58216).

2²³¹¹⁸¹ is an apocalyptic number.

It is an amenable number.

231181 is a deficient number, since it is larger than the sum of its proper divisors (1683).

231181 is a wasteful number, since it uses less digits than its factorization.

231181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1682.

The product of its digits is 48, while the sum is 16.

The square root of 231181 is about 480.8128534056. The cubic root of 231181 is about 61.3739458756.

The spelling of 231181 in words is "two hundred thirty-one thousand, one hundred eighty-one".