231801 has 4 divisors (see below), whose sum is σ = 309072. Its totient is φ = 154532.

The previous prime is 231799. The next prime is 231809. The reversal of 231801 is 108132.

It is a happy number.

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 231801 - 2¹ = 231799 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (231809) 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, 38631 + ... + 38636.

It is an arithmetic number, because the mean of its divisors is an integer number (77268).

2²³¹⁸⁰¹ is an apocalyptic number.

231801 is the 305-th centered pentagonal number.

It is an amenable number.

231801 is a deficient number, since it is larger than the sum of its proper divisors (77271).

231801 is an equidigital number, since it uses as much as digits as its factorization.

231801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77270.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 231801 is about 481.4571632035. The cubic root of 231801 is about 61.4287627798.

Adding to 231801 its reverse (108132), we get a palindrome (339933).

The spelling of 231801 in words is "two hundred thirty-one thousand, eight hundred one".