85243681 has 4 divisors (see below), whose sum is σ = 88949952. Its totient is φ = 81537412.

The previous prime is 85243649. The next prime is 85243699. The reversal of 85243681 is 18634258.

It is a happy number.

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 85243681 - 2⁵ = 85243649 is a prime.

It is a super-2 number, since 2×85243681² = 14532970300859522, which contains 22 as substring.

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 85243681.

It is not an unprimeable number, because it can be changed into a prime (85247681) 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, 1853101 + ... + 1853146.

It is an arithmetic number, because the mean of its divisors is an integer number (22237488).

Almost surely, 2^85243681 is an apocalyptic number.

It is an amenable number.

85243681 is a deficient number, since it is larger than the sum of its proper divisors (3706271).

85243681 is a wasteful number, since it uses less digits than its factorization.

85243681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3706270.

The product of its digits is 46080, while the sum is 37.

The square root of 85243681 is about 9232.7504569332. The cubic root of 85243681 is about 440.1027325545.

The spelling of 85243681 in words is "eighty-five million, two hundred forty-three thousand, six hundred eighty-one".