161586 has 24 divisors (see below), whose sum is σ = 359424. Its totient is φ = 52440.

The previous prime is 161573. The next prime is 161591. The reversal of 161586 is 685161.

It is a super-2 number, since 2×161586² = 52220070792, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

161586 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 751 + ... + 941.

It is an arithmetic number, because the mean of its divisors is an integer number (14976).

2¹⁶¹⁵⁸⁶ is an apocalyptic number.

161586 is an abundant number, since it is smaller than the sum of its proper divisors (197838).

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

161586 is a wasteful number, since it uses less digits than its factorization.

161586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 243 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 161586 is about 401.9776113168. The cubic root of 161586 is about 54.4671406446.

It can be divided in two parts, 161 and 586, that added together give a palindrome (747).

The spelling of 161586 in words is "one hundred sixty-one thousand, five hundred eighty-six".