168135811 has 4 divisors (see below), whose sum is σ = 169800624. Its totient is φ = 166471000.

The previous prime is 168135791. The next prime is 168135859. The reversal of 168135811 is 118531861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168135811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168130811) 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, 832255 + ... + 832456.

It is an arithmetic number, because the mean of its divisors is an integer number (42450156).

Almost surely, 2^168135811 is an apocalyptic number.

168135811 is a deficient number, since it is larger than the sum of its proper divisors (1664813).

168135811 is a wasteful number, since it uses less digits than its factorization.

168135811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664812.

The product of its digits is 5760, while the sum is 34.

The square root of 168135811 is about 12966.7193615039. The cubic root of 168135811 is about 551.9334826293.

The spelling of 168135811 in words is "one hundred sixty-eight million, one hundred thirty-five thousand, eight hundred eleven".