85639963 has 2 divisors, whose sum is σ = 85639964. Its totient is φ = 85639962.

The previous prime is 85639937. The next prime is 85639979. The reversal of 85639963 is 36993658.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85639963 is a prime.

It is not a weakly prime, because it can be changed into another prime (85639993) 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, 42819981 + 42819982.

It is an arithmetic number, because the mean of its divisors is an integer number (42819982).

Almost surely, 2^85639963 is an apocalyptic number.

85639963 is a deficient number, since it is larger than the sum of its proper divisors (1).

85639963 is an equidigital number, since it uses as much as digits as its factorization.

85639963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1049760, while the sum is 49.

The square root of 85639963 is about 9254.1862419124. The cubic root of 85639963 is about 440.7836636859.

The spelling of 85639963 in words is "eighty-five million, six hundred thirty-nine thousand, nine hundred sixty-three".