87189913 has 4 divisors (see below), whose sum is σ = 88004880. Its totient is φ = 86374948.

The previous prime is 87189911. The next prime is 87189919. The reversal of 87189913 is 31998178.

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 87189913 - 2¹ = 87189911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87189911) 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, 407323 + ... + 407536.

It is an arithmetic number, because the mean of its divisors is an integer number (22001220).

Almost surely, 2^87189913 is an apocalyptic number.

It is an amenable number.

87189913 is a deficient number, since it is larger than the sum of its proper divisors (814967).

87189913 is a wasteful number, since it uses less digits than its factorization.

87189913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814966.

The product of its digits is 108864, while the sum is 46.

The square root of 87189913 is about 9337.5539088136. The cubic root of 87189913 is about 443.4269468333.

The spelling of 87189913 in words is "eighty-seven million, one hundred eighty-nine thousand, nine hundred thirteen".