87186221 has 8 divisors (see below), whose sum is σ = 88035360. Its totient is φ = 86340528.

The previous prime is 87186199. The next prime is 87186223. The reversal of 87186221 is 12268178.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87186221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87186223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108995 + ... + 109791.

It is an arithmetic number, because the mean of its divisors is an integer number (11004420).

Almost surely, 2^87186221 is an apocalyptic number.

It is an amenable number.

87186221 is a deficient number, since it is larger than the sum of its proper divisors (849139).

87186221 is a wasteful number, since it uses less digits than its factorization.

87186221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723.

The product of its digits is 10752, while the sum is 35.

The square root of 87186221 is about 9337.3562104056. The cubic root of 87186221 is about 443.4206878700.

The spelling of 87186221 in words is "eighty-seven million, one hundred eighty-six thousand, two hundred twenty-one".