85603681 has 4 divisors (see below), whose sum is σ = 87917332. Its totient is φ = 83290032.

The previous prime is 85603663. The next prime is 85603709. The reversal of 85603681 is 18630658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18630658 = 2 ⋅9315329.

It can be written as a sum of positive squares in 2 ways, for example, as 32547025 + 53056656 = 5705^2 + 7284^2 .

It is a cyclic number.

It is not a de Polignac number, because 85603681 - 2⁹ = 85603169 is a prime.

It is a super-2 number, since 2×85603681² = 14655980401499522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 2313613 = 85603681 / (8 + 5 + 6 + 0 + 3 + 6 + 8 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85603681.

It is not an unprimeable number, because it can be changed into a prime (85603481) 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, 1156770 + ... + 1156843.

It is an arithmetic number, because the mean of its divisors is an integer number (21979333).

Almost surely, 2^85603681 is an apocalyptic number.

It is an amenable number.

85603681 is a deficient number, since it is larger than the sum of its proper divisors (2313651).

85603681 is a wasteful number, since it uses less digits than its factorization.

85603681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2313650.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 85603681 is about 9252.2257322225. The cubic root of 85603681 is about 440.7214078133.

The spelling of 85603681 in words is "eighty-five million, six hundred three thousand, six hundred eighty-one".