43112231 has 4 divisors (see below), whose sum is σ = 43441464. Its totient is φ = 42783000.

The previous prime is 43112203. The next prime is 43112233. The reversal of 43112231 is 13221134.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43112231 is a prime.

It is a super-2 number, since 2×43112231² = 3717328923594722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43112233) 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, 164420 + ... + 164681.

It is an arithmetic number, because the mean of its divisors is an integer number (10860366).

Almost surely, 2^43112231 is an apocalyptic number.

43112231 is a deficient number, since it is larger than the sum of its proper divisors (329233).

43112231 is a wasteful number, since it uses less digits than its factorization.

43112231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329232.

The product of its digits is 144, while the sum is 17.

The square root of 43112231 is about 6565.9904812602. The cubic root of 43112231 is about 350.6443395927.

Adding to 43112231 its reverse (13221134), we get a palindrome (56333365).

The spelling of 43112231 in words is "forty-three million, one hundred twelve thousand, two hundred thirty-one".