43135231 has 4 divisors (see below), whose sum is σ = 43538472. Its totient is φ = 42731992.

The previous prime is 43135217. The next prime is 43135243. The reversal of 43135231 is 13253134.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 43135231 - 2¹⁹ = 42610943 is a prime.

It is a super-2 number, since 2×43135231² = 3721296306846722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43135031) 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, 201460 + ... + 201673.

It is an arithmetic number, because the mean of its divisors is an integer number (10884618).

Almost surely, 2^43135231 is an apocalyptic number.

43135231 is a deficient number, since it is larger than the sum of its proper divisors (403241).

43135231 is a wasteful number, since it uses less digits than its factorization.

43135231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403240.

The product of its digits is 1080, while the sum is 22.

The square root of 43135231 is about 6567.7416971132. The cubic root of 43135231 is about 350.7066837417.

Adding to 43135231 its reverse (13253134), we get a palindrome (56388365).

The spelling of 43135231 in words is "forty-three million, one hundred thirty-five thousand, two hundred thirty-one".