6989378971 has 4 divisors (see below), whose sum is σ = 7151922712. Its totient is φ = 6826835232.

The previous prime is 6989378959. The next prime is 6989379011. The reversal of 6989378971 is 1798739896.

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 6989378971 - 2²⁹ = 6452508059 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6989378897 and 6989378906.

It is not an unprimeable number, because it can be changed into a prime (6989378471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81271806 + ... + 81271891.

It is an arithmetic number, because the mean of its divisors is an integer number (1787980678).

Almost surely, 2^6989378971 is an apocalyptic number.

6989378971 is a deficient number, since it is larger than the sum of its proper divisors (162543741).

6989378971 is a wasteful number, since it uses less digits than its factorization.

6989378971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162543740.

The product of its digits is 41150592, while the sum is 67.

The square root of 6989378971 is about 83602.5057698631. The cubic root of 6989378971 is about 1911.9632026781.

The spelling of 6989378971 in words is "six billion, nine hundred eighty-nine million, three hundred seventy-eight thousand, nine hundred seventy-one".