8138605971 has 8 divisors (see below), whose sum is σ = 10930683024. Its totient is φ = 5386133120.

The previous prime is 8138605967. The next prime is 8138605997. The reversal of 8138605971 is 1795068318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8138605971 - 2² = 8138605967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8138605971.

It is not an unprimeable number, because it can be changed into a prime (8138605931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9900570 + ... + 9901391.

It is an arithmetic number, because the mean of its divisors is an integer number (1366335378).

Almost surely, 2^8138605971 is an apocalyptic number.

8138605971 is a deficient number, since it is larger than the sum of its proper divisors (2792077053).

8138605971 is a wasteful number, since it uses less digits than its factorization.

8138605971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19802101.

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 8138605971 is about 90214.2226647218. Note that the first 3 decimals coincide. The cubic root of 8138605971 is about 2011.4844253452.

The spelling of 8138605971 in words is "eight billion, one hundred thirty-eight million, six hundred five thousand, nine hundred seventy-one".