231601 has 6 divisors (see below), whose sum is σ = 240306. Its totient is φ = 223200.

The previous prime is 231599. The next prime is 231607. The reversal of 231601 is 106132.

It can be written as a sum of positive squares in only one way, i.e., 216225 + 15376 = 465^2 + 124^2 .

It is not a de Polignac number, because 231601 - 2¹ = 231599 is a prime.

It is a Duffinian number.

231601 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (231607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 841 + ... + 1081.

It is an arithmetic number, because the mean of its divisors is an integer number (40051).

2²³¹⁶⁰¹ is an apocalyptic number.

231601 is the 241-st decagonal number.

It is an amenable number.

231601 is a deficient number, since it is larger than the sum of its proper divisors (8705).

231601 is an equidigital number, since it uses as much as digits as its factorization.

231601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 231601 is about 481.2494155841. The cubic root of 231601 is about 61.4110905988.

Adding to 231601 its reverse (106132), we get a palindrome (337733).

It can be divided in two parts, 231 and 601, that multiplied together give a palindrome (138831).

The spelling of 231601 in words is "two hundred thirty-one thousand, six hundred one".