43531231 has 2 divisors, whose sum is σ = 43531232. Its totient is φ = 43531230.

The previous prime is 43531219. The next prime is 43531273. The reversal of 43531231 is 13213534.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43531231 - 2⁹ = 43530719 is a prime.

It is a super-2 number, since 2×43531231² = 3789936144750722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43531531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21765615 + 21765616.

It is an arithmetic number, because the mean of its divisors is an integer number (21765616).

Almost surely, 2^43531231 is an apocalyptic number.

43531231 is a deficient number, since it is larger than the sum of its proper divisors (1).

43531231 is an equidigital number, since it uses as much as digits as its factorization.

43531231 is an evil number, because the sum of its binary digits is even.

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

The square root of 43531231 is about 6597.8201703290. The cubic root of 43531231 is about 351.7766290097.

Adding to 43531231 its reverse (13213534), we get a palindrome (56744765).

The spelling of 43531231 in words is "forty-three million, five hundred thirty-one thousand, two hundred thirty-one".