8218711841 has 4 divisors (see below), whose sum is σ = 8353444884. Its totient is φ = 8083978800.

The previous prime is 8218711817. The next prime is 8218711843. The reversal of 8218711841 is 1481178128.

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 115111441 + 8103600400 = 10729^2 + 90020^2 .

It is a cyclic number.

It is not a de Polignac number, because 8218711841 - 2²² = 8214517537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8218711843) 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, 67366430 + ... + 67366551.

It is an arithmetic number, because the mean of its divisors is an integer number (2088361221).

Almost surely, 2^8218711841 is an apocalyptic number.

It is an amenable number.

8218711841 is a deficient number, since it is larger than the sum of its proper divisors (134733043).

8218711841 is a wasteful number, since it uses less digits than its factorization.

8218711841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134733042.

The product of its digits is 28672, while the sum is 41.

The square root of 8218711841 is about 90657.1113647462. Note that the first 3 decimals coincide. The cubic root of 8218711841 is about 2018.0623710563.

Adding to 8218711841 its reverse (1481178128), we get a palindrome (9699889969).

The spelling of 8218711841 in words is "eight billion, two hundred eighteen million, seven hundred eleven thousand, eight hundred forty-one".