161705136 has 20 divisors (see below), whose sum is σ = 417738392. Its totient is φ = 53901696.

The previous prime is 161705129. The next prime is 161705153. The reversal of 161705136 is 631507161.

It is a super-2 number, since 2×161705136² = 52297102017556992, which contains 22 as substring.

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, 1684381 + ... + 1684476.

Almost surely, 2^161705136 is an apocalyptic number.

161705136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161705136 is an abundant number, since it is smaller than the sum of its proper divisors (256033256).

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

161705136 is a wasteful number, since it uses less digits than its factorization.

161705136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3368868 (or 3368862 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 161705136 is about 12716.3334338165. Note that the first 3 decimals coincide. The cubic root of 161705136 is about 544.8052341113.

The spelling of 161705136 in words is "one hundred sixty-one million, seven hundred five thousand, one hundred thirty-six".