85211639 has 4 divisors (see below), whose sum is σ = 85296120. Its totient is φ = 85127160.

The previous prime is 85211627. The next prime is 85211641. The reversal of 85211639 is 93611258.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85211639 - 2⁸ = 85211383 is a prime.

It is a super-2 number, since 2×85211639² = 14522046842132642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85211599 and 85211608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85211699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40709 + ... + 42750.

It is an arithmetic number, because the mean of its divisors is an integer number (21324030).

Almost surely, 2^85211639 is an apocalyptic number.

85211639 is a deficient number, since it is larger than the sum of its proper divisors (84481).

85211639 is a wasteful number, since it uses less digits than its factorization.

85211639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84480.

The product of its digits is 12960, while the sum is 35.

The square root of 85211639 is about 9231.0150579446. The cubic root of 85211639 is about 440.0475826640.

The spelling of 85211639 in words is "eighty-five million, two hundred eleven thousand, six hundred thirty-nine".