85547681 has 4 divisors (see below), whose sum is σ = 86950164. Its totient is φ = 84145200.

The previous prime is 85547653. The next prime is 85547711. The reversal of 85547681 is 18674558.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21307456 + 64240225 = 4616^2 + 8015^2 .

It is a cyclic number.

It is not a de Polignac number, because 85547681 - 2⁶ = 85547617 is a prime.

It is a super-2 number, since 2×85547681² = 14636811448955522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85547611) 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, 701150 + ... + 701271.

It is an arithmetic number, because the mean of its divisors is an integer number (21737541).

Almost surely, 2^85547681 is an apocalyptic number.

It is an amenable number.

85547681 is a deficient number, since it is larger than the sum of its proper divisors (1402483).

85547681 is a wasteful number, since it uses less digits than its factorization.

85547681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402482.

The product of its digits is 268800, while the sum is 44.

The square root of 85547681 is about 9249.1989382865. The cubic root of 85547681 is about 440.6252835100.

The spelling of 85547681 in words is "eighty-five million, five hundred forty-seven thousand, six hundred eighty-one".