87221189 has 4 divisors (see below), whose sum is σ = 95150400. Its totient is φ = 79291980.

The previous prime is 87221179. The next prime is 87221207. The reversal of 87221189 is 98112278.

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.

It is a cyclic number.

It is not a de Polignac number, because 87221189 - 2²⁰ = 86172613 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 (87221179) 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, 3964589 + ... + 3964610.

It is an arithmetic number, because the mean of its divisors is an integer number (23787600).

Almost surely, 2^87221189 is an apocalyptic number.

It is an amenable number.

87221189 is a deficient number, since it is larger than the sum of its proper divisors (7929211).

87221189 is a wasteful number, since it uses less digits than its factorization.

87221189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7929210.

The product of its digits is 16128, while the sum is 38.

The square root of 87221189 is about 9339.2285013271. The cubic root of 87221189 is about 443.4799612351.

The spelling of 87221189 in words is "eighty-seven million, two hundred twenty-one thousand, one hundred eighty-nine".