87173231 has 8 divisors (see below), whose sum is σ = 88669824. Its totient is φ = 85682520.

The previous prime is 87173227. The next prime is 87173269. The reversal of 87173231 is 13237178.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87173231 - 2² = 87173227 is a prime.

It is a super-3 number, since 3×87173231³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87173291) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 36566 + ... + 38876.

It is an arithmetic number, because the mean of its divisors is an integer number (11083728).

Almost surely, 2^87173231 is an apocalyptic number.

87173231 is a deficient number, since it is larger than the sum of its proper divisors (1496593).

87173231 is a wasteful number, since it uses less digits than its factorization.

87173231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2941.

The product of its digits is 7056, while the sum is 32.

The square root of 87173231 is about 9336.6605914535. The cubic root of 87173231 is about 443.3986648150.

The spelling of 87173231 in words is "eighty-seven million, one hundred seventy-three thousand, two hundred thirty-one".