87544221 has 16 divisors (see below), whose sum is σ = 119864064. Its totient is φ = 56807424.

The previous prime is 87544201. The next prime is 87544241. The reversal of 87544221 is 12244578.

It is an interprime number because it is at equal distance from previous prime (87544201) and next prime (87544241).

It is not a de Polignac number, because 87544221 - 2¹¹ = 87542173 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87544201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25605 + ... + 28821.

It is an arithmetic number, because the mean of its divisors is an integer number (7491504).

Almost surely, 2^87544221 is an apocalyptic number.

It is an amenable number.

87544221 is a deficient number, since it is larger than the sum of its proper divisors (32319843).

87544221 is a wasteful number, since it uses less digits than its factorization.

87544221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3460.

The product of its digits is 17920, while the sum is 33.

The square root of 87544221 is about 9356.5068802412. The cubic root of 87544221 is about 444.0267768528.

Adding to 87544221 its reverse (12244578), we get a palindrome (99788799).

The spelling of 87544221 in words is "eighty-seven million, five hundred forty-four thousand, two hundred twenty-one".