87188389 has 2 divisors, whose sum is σ = 87188390. Its totient is φ = 87188388.

The previous prime is 87188369. The next prime is 87188401. The reversal of 87188389 is 98388178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51008164 + 36180225 = 7142^2 + 6015^2 .

It is a cyclic number.

It is not a de Polignac number, because 87188389 - 2¹⁷ = 87057317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87188369) 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, 43594194 + 43594195.

It is an arithmetic number, because the mean of its divisors is an integer number (43594195).

Almost surely, 2^87188389 is an apocalyptic number.

It is an amenable number.

87188389 is a deficient number, since it is larger than the sum of its proper divisors (1).

87188389 is an equidigital number, since it uses as much as digits as its factorization.

87188389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 52.

The square root of 87188389 is about 9337.4723025024. The cubic root of 87188389 is about 443.4243632523.

The spelling of 87188389 in words is "eighty-seven million, one hundred eighty-eight thousand, three hundred eighty-nine".