231443536 has 20 divisors (see below), whose sum is σ = 448988500. Its totient is φ = 115575552.

The previous prime is 231443533. The next prime is 231443543. The reversal of 231443536 is 635344132.

It can be written as a sum of positive squares in 2 ways, for example, as 197571136 + 33872400 = 14056^2 + 5820^2 .

It is a super-2 number, since 2×231443536² = 107132220712366592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231443498 and 231443507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231443533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4540 + ... + 21988.

It is an arithmetic number, because the mean of its divisors is an integer number (22449425).

Almost surely, 2^231443536 is an apocalyptic number.

It is an amenable number.

231443536 is a deficient number, since it is larger than the sum of its proper divisors (217544964).

231443536 is a wasteful number, since it uses less digits than its factorization.

231443536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18286 (or 18280 counting only the distinct ones).

The product of its digits is 25920, while the sum is 31.

The square root of 231443536 is about 15213.2684193766. The cubic root of 231443536 is about 613.9716977762.

Adding to 231443536 its reverse (635344132), we get a palindrome (866787668).

The spelling of 231443536 in words is "two hundred thirty-one million, four hundred forty-three thousand, five hundred thirty-six".