43243391 has 2 divisors, whose sum is σ = 43243392. Its totient is φ = 43243390.

The previous prime is 43243367. The next prime is 43243399. The reversal of 43243391 is 19334234.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43243391 - 2¹⁴ = 43227007 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43243399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21621695 + 21621696.

It is an arithmetic number, because the mean of its divisors is an integer number (21621696).

Almost surely, 2^43243391 is an apocalyptic number.

43243391 is a deficient number, since it is larger than the sum of its proper divisors (1).

43243391 is an equidigital number, since it uses as much as digits as its factorization.

43243391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 29.

The square root of 43243391 is about 6575.9707268205. The cubic root of 43243391 is about 350.9995671025. Note that the first 3 decimals are identical.

It can be divided in two parts, 43243 and 391, that added together give a palindrome (43634).

The spelling of 43243391 in words is "forty-three million, two hundred forty-three thousand, three hundred ninety-one".