168543401 has 4 divisors (see below), whose sum is σ = 181508292. Its totient is φ = 155578512.

The previous prime is 168543383. The next prime is 168543409. The reversal of 168543401 is 104345861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 104345861 = 41 ⋅2545021.

It can be written as a sum of positive squares in 2 ways, for example, as 27290176 + 141253225 = 5224^2 + 11885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168543401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (168543409) 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, 6482426 + ... + 6482451.

It is an arithmetic number, because the mean of its divisors is an integer number (45377073).

Almost surely, 2^168543401 is an apocalyptic number.

It is an amenable number.

168543401 is a deficient number, since it is larger than the sum of its proper divisors (12964891).

168543401 is a wasteful number, since it uses less digits than its factorization.

168543401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12964890.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 168543401 is about 12982.4266221689. The cubic root of 168543401 is about 552.3791164866.

The spelling of 168543401 in words is "one hundred sixty-eight million, five hundred forty-three thousand, four hundred one".