43642331 has 2 divisors, whose sum is σ = 43642332. Its totient is φ = 43642330.

The previous prime is 43642301. The next prime is 43642369. The reversal of 43642331 is 13324634.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43642331 - 2¹⁰ = 43641307 is a prime.

It is a super-2 number, since 2×43642331² = 3809306110227122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43642331.

It is not a weakly prime, because it can be changed into another prime (43642301) 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, 21821165 + 21821166.

It is an arithmetic number, because the mean of its divisors is an integer number (21821166).

Almost surely, 2^43642331 is an apocalyptic number.

43642331 is a deficient number, since it is larger than the sum of its proper divisors (1).

43642331 is an equidigital number, since it uses as much as digits as its factorization.

43642331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 26.

The square root of 43642331 is about 6606.2342525829. The cubic root of 43642331 is about 352.0756417804.

Adding to 43642331 its reverse (13324634), we get a palindrome (56966965).

The spelling of 43642331 in words is "forty-three million, six hundred forty-two thousand, three hundred thirty-one".