87118189 has 2 divisors, whose sum is σ = 87118190. Its totient is φ = 87118188.

The previous prime is 87118151. The next prime is 87118219. The reversal of 87118189 is 98181178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47955625 + 39162564 = 6925^2 + 6258^2 .

It is a cyclic number.

It is not a de Polignac number, because 87118189 - 2⁹ = 87117677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87118289) 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 as a sum of consecutive naturals, namely, 43559094 + 43559095.

It is an arithmetic number, because the mean of its divisors is an integer number (43559095).

Almost surely, 2^87118189 is an apocalyptic number.

It is an amenable number.

87118189 is a deficient number, since it is larger than the sum of its proper divisors (1).

87118189 is an equidigital number, since it uses as much as digits as its factorization.

87118189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 43.

The square root of 87118189 is about 9333.7124982506. The cubic root of 87118189 is about 443.3053231341.

It can be divided in two parts, 8711 and 8189, that added together give a square (16900 = 130²).

The spelling of 87118189 in words is "eighty-seven million, one hundred eighteen thousand, one hundred eighty-nine".