8471545681 has 3 divisors (see below), whose sum is σ = 8471637723. Its totient is φ = 8471453640.

The previous prime is 8471545661. The next prime is 8471545759. The reversal of 8471545681 is 1865451748.

The square root of 8471545681 is 92041.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 4957427281 + 3514118400 = 70409^2 + 59280^2 .

It is a de Polignac number, because none of the positive numbers 2^k-8471545681 is a prime.

It is a super-2 number, since 2×8471545681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8471545661) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 46021 + ... + 138061.

It is an arithmetic number, because the mean of its divisors is an integer number (2823879241).

Almost surely, 2^8471545681 is an apocalyptic number.

8471545681 is the 92041-st square number.

8471545681 is the 46021-st centered octagonal number.

It is an amenable number.

8471545681 is a deficient number, since it is larger than the sum of its proper divisors (92042).

8471545681 is an frugal number, since it uses more digits than its factorization.

8471545681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184082 (or 92041 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 49.

The cubic root of 8471545681 is about 2038.5477361714.

Multiplying 8471545681 by its sum of digits (49), we get a square (415105738369 = 644287²).

The spelling of 8471545681 in words is "eight billion, four hundred seventy-one million, five hundred forty-five thousand, six hundred eighty-one".