6218979971 has 4 divisors (see below), whose sum is σ = 6236597832. Its totient is φ = 6201362112.

The previous prime is 6218979947. The next prime is 6218979979. The reversal of 6218979971 is 1799798126.

6218979971 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6218979971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6218979971.

It is not an unprimeable number, because it can be changed into a prime (6218979979) 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, 8808401 + ... + 8809106.

It is an arithmetic number, because the mean of its divisors is an integer number (1559149458).

Almost surely, 2^6218979971 is an apocalyptic number.

6218979971 is a deficient number, since it is larger than the sum of its proper divisors (17617861).

6218979971 is a wasteful number, since it uses less digits than its factorization.

6218979971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17617860.

The product of its digits is 3429216, while the sum is 59.

The square root of 6218979971 is about 78860.5095786224. The cubic root of 6218979971 is about 1838.9632599887.

The spelling of 6218979971 in words is "six billion, two hundred eighteen million, nine hundred seventy-nine thousand, nine hundred seventy-one".