87161 has 4 divisors (see below), whose sum is σ = 89232. Its totient is φ = 85092.

The previous prime is 87151. The next prime is 87179. The reversal of 87161 is 16178.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16178 = 2 ⋅8089.

It is a cyclic number.

It is not a de Polignac number, because 87161 - 2¹⁰ = 86137 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 971 + ... + 1056.

It is an arithmetic number, because the mean of its divisors is an integer number (22308).

2⁸⁷¹⁶¹ is an apocalyptic number.

It is an amenable number.

87161 is a deficient number, since it is larger than the sum of its proper divisors (2071).

87161 is a wasteful number, since it uses less digits than its factorization.

87161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2070.

The product of its digits is 336, while the sum is 23.

The square root of 87161 is about 295.2304184870. The cubic root of 87161 is about 44.3377926558.

The spelling of 87161 in words is "eighty-seven thousand, one hundred sixty-one".