4243391 has 2 divisors, whose sum is σ = 4243392. Its totient is φ = 4243390.

The previous prime is 4243361. The next prime is 4243397. The reversal of 4243391 is 1933424.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4243391 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4243391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4243397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121695 + 2121696.

It is an arithmetic number, because the mean of its divisors is an integer number (2121696).

Almost surely, 2^4243391 is an apocalyptic number.

4243391 is a deficient number, since it is larger than the sum of its proper divisors (1).

4243391 is an equidigital number, since it uses as much as digits as its factorization.

4243391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 26.

The square root of 4243391 is about 2059.9492712200. The cubic root of 4243391 is about 161.8965833884.

It can be divided in two parts, 42433 and 91, that added together give a palindrome (42524).

The spelling of 4243391 in words is "four million, two hundred forty-three thousand, three hundred ninety-one".