168538133 has 2 divisors, whose sum is σ = 168538134. Its totient is φ = 168538132.

The previous prime is 168538129. The next prime is 168538147. The reversal of 168538133 is 331835861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157201444 + 11336689 = 12538^2 + 3367^2 .

It is a cyclic number.

It is not a de Polignac number, because 168538133 - 2² = 168538129 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168538333) 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, 84269066 + 84269067.

It is an arithmetic number, because the mean of its divisors is an integer number (84269067).

Almost surely, 2^168538133 is an apocalyptic number.

It is an amenable number.

168538133 is a deficient number, since it is larger than the sum of its proper divisors (1).

168538133 is an equidigital number, since it uses as much as digits as its factorization.

168538133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 168538133 is about 12982.2237309330. The cubic root of 168538133 is about 552.3733613646.

The spelling of 168538133 in words is "one hundred sixty-eight million, five hundred thirty-eight thousand, one hundred thirty-three".