85501643 has 4 divisors (see below), whose sum is σ = 85524720. Its totient is φ = 85478568.

The previous prime is 85501613. The next prime is 85501699. The reversal of 85501643 is 34610558.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34610558 = 2 ⋅17305279.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85501643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85501613) 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 in 3 ways as a sum of consecutive naturals, for example, 4583 + ... + 13856.

It is an arithmetic number, because the mean of its divisors is an integer number (21381180).

Almost surely, 2^85501643 is an apocalyptic number.

85501643 is a deficient number, since it is larger than the sum of its proper divisors (23077).

85501643 is a wasteful number, since it uses less digits than its factorization.

85501643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23076.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 85501643 is about 9246.7098472916. The cubic root of 85501643 is about 440.5462276098.

It can be divided in two parts, 8550 and 1643, that multiplied together give a triangular number (14047650 = T₅₃₀₀).

The spelling of 85501643 in words is "eighty-five million, five hundred one thousand, six hundred forty-three".