87189169 has 4 divisors (see below), whose sum is σ = 87319396. Its totient is φ = 87058944.

The previous prime is 87189163. The next prime is 87189173. The reversal of 87189169 is 96198178.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8334769 + 78854400 = 2887^2 + 8880^2 .

It is a cyclic number.

It is not a de Polignac number, because 87189169 - 2¹⁹ = 86664881 is a prime.

It is a super-2 number, since 2×87189169² = 15203902381821122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87189163) 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 3 ways as a sum of consecutive naturals, for example, 64104 + ... + 65449.

It is an arithmetic number, because the mean of its divisors is an integer number (21829849).

Almost surely, 2^87189169 is an apocalyptic number.

It is an amenable number.

87189169 is a deficient number, since it is larger than the sum of its proper divisors (130227).

87189169 is a wasteful number, since it uses less digits than its factorization.

87189169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130226.

The product of its digits is 217728, while the sum is 49.

The square root of 87189169 is about 9337.5140696012. The cubic root of 87189169 is about 443.4256855613.

Subtracting 87189169 from its reverse (96198178), we obtain a palindrome (9009009).

The spelling of 87189169 in words is "eighty-seven million, one hundred eighty-nine thousand, one hundred sixty-nine".