168993943 has 2 divisors, whose sum is σ = 168993944. Its totient is φ = 168993942.

The previous prime is 168993941. The next prime is 168993953. The reversal of 168993943 is 349399861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 168993943 - 2¹ = 168993941 is a prime.

Together with 168993941, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168993941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84496971 + 84496972.

It is an arithmetic number, because the mean of its divisors is an integer number (84496972).

Almost surely, 2^168993943 is an apocalyptic number.

168993943 is a deficient number, since it is larger than the sum of its proper divisors (1).

168993943 is an equidigital number, since it uses as much as digits as its factorization.

168993943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1259712, while the sum is 52.

The square root of 168993943 is about 12999.7670363742. The cubic root of 168993943 is about 552.8708762024.

The spelling of 168993943 in words is "one hundred sixty-eight million, nine hundred ninety-three thousand, nine hundred forty-three".