231536 has 20 divisors (see below), whose sum is σ = 465000. Its totient is φ = 111552.

The previous prime is 231533. The next prime is 231547. The reversal of 231536 is 635132.

231536 = T₂₅ + T₂₆ + ... + T₁₁₁.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215 + ... + 713.

It is an arithmetic number, because the mean of its divisors is an integer number (23250).

2²³¹⁵³⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232500).

231536 is an abundant number, since it is smaller than the sum of its proper divisors (233464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231536 is a wasteful number, since it uses less digits than its factorization.

231536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536 (or 530 counting only the distinct ones).

The product of its digits is 540, while the sum is 20.

The square root of 231536 is about 481.1818782955. The cubic root of 231536 is about 61.4053449495.

Adding to 231536 its reverse (635132), we get a palindrome (866668).

It can be divided in two parts, 231 and 536, that added together give a palindrome (767).

The spelling of 231536 in words is "two hundred thirty-one thousand, five hundred thirty-six".