85559987 has 2 divisors, whose sum is σ = 85559988. Its totient is φ = 85559986.

The previous prime is 85559959. The next prime is 85560001. The reversal of 85559987 is 78995558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85559987 - 2¹⁸ = 85297843 is a prime.

It is a super-2 number, since 2×85559987² = 14641022750880338, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85553987) 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, 42779993 + 42779994.

It is an arithmetic number, because the mean of its divisors is an integer number (42779994).

Almost surely, 2^85559987 is an apocalyptic number.

85559987 is a deficient number, since it is larger than the sum of its proper divisors (1).

85559987 is an equidigital number, since it uses as much as digits as its factorization.

85559987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536000, while the sum is 56.

The square root of 85559987 is about 9249.8641611647. The cubic root of 85559987 is about 440.6464104212.

The spelling of 85559987 in words is "eighty-five million, five hundred fifty-nine thousand, nine hundred eighty-seven".