43420331 has 2 divisors, whose sum is σ = 43420332. Its totient is φ = 43420330.

The previous prime is 43420319. The next prime is 43420379. The reversal of 43420331 is 13302434.

43420331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43420331 - 2¹⁰ = 43419307 is a prime.

It is a super-2 number, since 2×43420331² = 3770650288299122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43420381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21710165 + 21710166.

It is an arithmetic number, because the mean of its divisors is an integer number (21710166).

Almost surely, 2^43420331 is an apocalyptic number.

43420331 is a deficient number, since it is larger than the sum of its proper divisors (1).

43420331 is an equidigital number, since it uses as much as digits as its factorization.

43420331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 43420331 is about 6589.4105199175. The cubic root of 43420331 is about 351.4776466990.

Adding to 43420331 its reverse (13302434), we get a palindrome (56722765).

The spelling of 43420331 in words is "forty-three million, four hundred twenty thousand, three hundred thirty-one".