231669 has 6 divisors (see below), whose sum is σ = 334646. Its totient is φ = 154440.

The previous prime is 231661. The next prime is 231677. The reversal of 231669 is 966132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (231661) and next prime (231677).

It can be written as a sum of positive squares in only one way, i.e., 213444 + 18225 = 462^2 + 135^2 .

It is not a de Polignac number, because 231669 - 2³ = 231661 is a prime.

It is a super-2 number, since 2×231669² = 107341051122, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2³ + 3¹¹ + 6⁵ + 1 + 6⁶ + 9² .

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231661) 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, 12862 + ... + 12879.

2²³¹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

231669 is a deficient number, since it is larger than the sum of its proper divisors (102977).

231669 is a wasteful number, since it uses less digits than its factorization.

231669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25747 (or 25744 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 231669 is about 481.3200598354. The cubic root of 231669 is about 61.4171002815.

It can be divided in two parts, 231 and 669, that added together give a square (900 = 30²).

The spelling of 231669 in words is "two hundred thirty-one thousand, six hundred sixty-nine".