168509136 has 20 divisors (see below), whose sum is σ = 435315392. Its totient is φ = 56169696.

The previous prime is 168509113. The next prime is 168509167. The reversal of 168509136 is 631905861.

It is a junction number, because it is equal to n+sod(n) for n = 168509094 and 168509103.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1755256 + ... + 1755351.

Almost surely, 2^168509136 is an apocalyptic number.

168509136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

168509136 is an abundant number, since it is smaller than the sum of its proper divisors (266806256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

168509136 is a wasteful number, since it uses less digits than its factorization.

168509136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510618 (or 3510612 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 168509136 is about 12981.1068865486. The cubic root of 168509136 is about 552.3416809198.

The spelling of 168509136 in words is "one hundred sixty-eight million, five hundred nine thousand, one hundred thirty-six".