168387133 has 4 divisors (see below), whose sum is σ = 173819008. Its totient is φ = 162955260.

The previous prime is 168387127. The next prime is 168387169. The reversal of 168387133 is 331783861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 331783861 = 157 ⋅2113273.

It is a cyclic number.

It is not a de Polignac number, because 168387133 - 2¹⁷ = 168256061 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 (168387103) 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, 2715891 + ... + 2715952.

It is an arithmetic number, because the mean of its divisors is an integer number (43454752).

Almost surely, 2^168387133 is an apocalyptic number.

It is an amenable number.

168387133 is a deficient number, since it is larger than the sum of its proper divisors (5431875).

168387133 is an equidigital number, since it uses as much as digits as its factorization.

168387133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5431874.

The product of its digits is 72576, while the sum is 40.

The square root of 168387133 is about 12976.4067830814. The cubic root of 168387133 is about 552.2083476708.

The spelling of 168387133 in words is "one hundred sixty-eight million, three hundred eighty-seven thousand, one hundred thirty-three".