85163987 has 2 divisors, whose sum is σ = 85163988. Its totient is φ = 85163986.

The previous prime is 85163977. The next prime is 85163993. The reversal of 85163987 is 78936158.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85163987 - 2⁴ = 85163971 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85163957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42581993 + 42581994.

It is an arithmetic number, because the mean of its divisors is an integer number (42581994).

Almost surely, 2^85163987 is an apocalyptic number.

85163987 is a deficient number, since it is larger than the sum of its proper divisors (1).

85163987 is an equidigital number, since it uses as much as digits as its factorization.

85163987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 47.

The square root of 85163987 is about 9228.4336157335. The cubic root of 85163987 is about 439.9655396565.

The spelling of 85163987 in words is "eighty-five million, one hundred sixty-three thousand, nine hundred eighty-seven".