165249943 has 2 divisors, whose sum is σ = 165249944. Its totient is φ = 165249942.

The previous prime is 165249941. The next prime is 165249947. The reversal of 165249943 is 349942561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165249943 - 2¹ = 165249941 is a prime.

Together with 165249941, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 165249943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165249941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82624971 + 82624972.

It is an arithmetic number, because the mean of its divisors is an integer number (82624972).

Almost surely, 2^165249943 is an apocalyptic number.

165249943 is a deficient number, since it is larger than the sum of its proper divisors (1).

165249943 is an equidigital number, since it uses as much as digits as its factorization.

165249943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 43.

The square root of 165249943 is about 12854.9579151392. The cubic root of 165249943 is about 548.7574627939.

The spelling of 165249943 in words is "one hundred sixty-five million, two hundred forty-nine thousand, nine hundred forty-three".