85639937 has 2 divisors, whose sum is σ = 85639938. Its totient is φ = 85639936.

The previous prime is 85639921. The next prime is 85639963. The reversal of 85639937 is 73993658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83156161 + 2483776 = 9119^2 + 1576^2 .

It is a cyclic number.

It is not a de Polignac number, because 85639937 - 2⁴ = 85639921 is a prime.

It is not a weakly prime, because it can be changed into another prime (85639237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42819968 + 42819969.

It is an arithmetic number, because the mean of its divisors is an integer number (42819969).

Almost surely, 2^85639937 is an apocalyptic number.

It is an amenable number.

85639937 is a deficient number, since it is larger than the sum of its proper divisors (1).

85639937 is an equidigital number, since it uses as much as digits as its factorization.

85639937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 50.

The square root of 85639937 is about 9254.1848371426. The cubic root of 85639937 is about 440.7836190791.

The spelling of 85639937 in words is "eighty-five million, six hundred thirty-nine thousand, nine hundred thirty-seven".