161605236 has 36 divisors (see below), whose sum is σ = 408321312. Its totient is φ = 49724064.

The previous prime is 161605229. The next prime is 161605237. The reversal of 161605236 is 632506161.

161605236 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161605236² = 52232504605231392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161605237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37816 + ... + 41871.

Almost surely, 2^161605236 is an apocalyptic number.

It is an amenable number.

161605236 is an abundant number, since it is smaller than the sum of its proper divisors (246716076).

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

161605236 is a wasteful number, since it uses less digits than its factorization.

161605236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79720 (or 79705 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 161605236 is about 12712.4048079032. The cubic root of 161605236 is about 544.6930190511.

The spelling of 161605236 in words is "one hundred sixty-one million, six hundred five thousand, two hundred thirty-six".