85653681 has 4 divisors (see below), whose sum is σ = 114204912. Its totient is φ = 57102452.

The previous prime is 85653647. The next prime is 85653703. The reversal of 85653681 is 18635658.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85653681 - 2⁷ = 85653553 is a prime.

It is a super-2 number, since 2×85653681² = 14673106137699522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (85653641) 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, 14275611 + ... + 14275616.

It is an arithmetic number, because the mean of its divisors is an integer number (28551228).

Almost surely, 2^85653681 is an apocalyptic number.

It is an amenable number.

85653681 is a deficient number, since it is larger than the sum of its proper divisors (28551231).

85653681 is a wasteful number, since it uses less digits than its factorization.

85653681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28551230.

The product of its digits is 172800, while the sum is 42.

The square root of 85653681 is about 9254.9273903148. The cubic root of 85653681 is about 440.8071976656.

It can be divided in two parts, 8565 and 3681, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 85653681 in words is "eighty-five million, six hundred fifty-three thousand, six hundred eighty-one".