8638437811 has 4 divisors (see below), whose sum is σ = 8735499000. Its totient is φ = 8541376624.

The previous prime is 8638437781. The next prime is 8638437823. The reversal of 8638437811 is 1187348368.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 8638437811 - 2¹¹ = 8638435763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8638437011) 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, 48530461 + ... + 48530638.

It is an arithmetic number, because the mean of its divisors is an integer number (2183874750).

Almost surely, 2^8638437811 is an apocalyptic number.

8638437811 is a deficient number, since it is larger than the sum of its proper divisors (97061189).

8638437811 is an equidigital number, since it uses as much as digits as its factorization.

8638437811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97061188.

The product of its digits is 774144, while the sum is 49.

The square root of 8638437811 is about 92943.1966902366. The cubic root of 8638437811 is about 2051.8474570014.

The spelling of 8638437811 in words is "eight billion, six hundred thirty-eight million, four hundred thirty-seven thousand, eight hundred eleven".