43243261 has 2 divisors, whose sum is σ = 43243262. Its totient is φ = 43243260.

The previous prime is 43243219. The next prime is 43243267. The reversal of 43243261 is 16234234.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42172036 + 1071225 = 6494^2 + 1035^2 .

It is a cyclic number.

It is not a de Polignac number, because 43243261 - 2⁷ = 43243133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43243267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21621630 + 21621631.

It is an arithmetic number, because the mean of its divisors is an integer number (21621631).

Almost surely, 2^43243261 is an apocalyptic number.

It is an amenable number.

43243261 is a deficient number, since it is larger than the sum of its proper divisors (1).

43243261 is an equidigital number, since it uses as much as digits as its factorization.

43243261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 25.

The square root of 43243261 is about 6575.9608423408. The cubic root of 43243261 is about 350.9992153726. Note that the first 3 decimals are identical.

Adding to 43243261 its reverse (16234234), we get a palindrome (59477495).

The spelling of 43243261 in words is "forty-three million, two hundred forty-three thousand, two hundred sixty-one".