87123559 has 2 divisors, whose sum is σ = 87123560. Its totient is φ = 87123558.

The previous prime is 87123541. The next prime is 87123581. The reversal of 87123559 is 95532178.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87123559 - 2⁷ = 87123431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87120559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43561779 + 43561780.

It is an arithmetic number, because the mean of its divisors is an integer number (43561780).

Almost surely, 2^87123559 is an apocalyptic number.

87123559 is a deficient number, since it is larger than the sum of its proper divisors (1).

87123559 is an equidigital number, since it uses as much as digits as its factorization.

87123559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 40.

The square root of 87123559 is about 9334.0001607028. Note that the first 3 decimals coincide. The cubic root of 87123559 is about 443.3144314527.

The spelling of 87123559 in words is "eighty-seven million, one hundred twenty-three thousand, five hundred fifty-nine".