168343391 has 4 divisors (see below), whose sum is σ = 170474400. Its totient is φ = 166212384.

The previous prime is 168343387. The next prime is 168343433. The reversal of 168343391 is 193343861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193343861 = 461 ⋅419401.

It is a cyclic number.

It is not a de Polignac number, because 168343391 - 2² = 168343387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168343321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1065386 + ... + 1065543.

It is an arithmetic number, because the mean of its divisors is an integer number (42618600).

Almost surely, 2^168343391 is an apocalyptic number.

168343391 is a deficient number, since it is larger than the sum of its proper divisors (2131009).

168343391 is an equidigital number, since it uses as much as digits as its factorization.

168343391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131008.

The product of its digits is 46656, while the sum is 38.

The square root of 168343391 is about 12974.7212301459. The cubic root of 168343391 is about 552.1605277276.

The spelling of 168343391 in words is "one hundred sixty-eight million, three hundred forty-three thousand, three hundred ninety-one".