161587 has 4 divisors (see below), whose sum is σ = 162400. Its totient is φ = 160776.

The previous prime is 161573. The next prime is 161591. The reversal of 161587 is 785161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 785161 = 13 ⋅60397.

It is a cyclic number.

It is not a de Polignac number, because 161587 - 2⁷ = 161459 is a prime.

It is a super-2 number, since 2×161587² = 52220717138, which contains 22 as substring.

It is a Duffinian number.

161587 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (161507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118 + ... + 580.

It is an arithmetic number, because the mean of its divisors is an integer number (40600).

161587 is a Friedman number, since it can be written as 11^5+67*8, using all its digits and the basic arithmetic operations.

2¹⁶¹⁵⁸⁷ is an apocalyptic number.

161587 is a deficient number, since it is larger than the sum of its proper divisors (813).

161587 is an equidigital number, since it uses as much as digits as its factorization.

161587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812.

The product of its digits is 1680, while the sum is 28.

The square root of 161587 is about 401.9788551653. The cubic root of 161587 is about 54.4672530038.

The spelling of 161587 in words is "one hundred sixty-one thousand, five hundred eighty-seven".