201689443 has 2 divisors, whose sum is σ = 201689444. Its totient is φ = 201689442.

The previous prime is 201689413. The next prime is 201689459. The reversal of 201689443 is 344986102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201689443 - 2⁹ = 201688931 is a prime.

It is not a weakly prime, because it can be changed into another prime (201689413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100844721 + 100844722.

It is an arithmetic number, because the mean of its divisors is an integer number (100844722).

Almost surely, 2^201689443 is an apocalyptic number.

201689443 is a deficient number, since it is larger than the sum of its proper divisors (1).

201689443 is an equidigital number, since it uses as much as digits as its factorization.

201689443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 201689443 is about 14201.7408439951. The cubic root of 201689443 is about 586.4455865001.

The spelling of 201689443 in words is "two hundred one million, six hundred eighty-nine thousand, four hundred forty-three".