6978551 has 8 divisors (see below), whose sum is σ = 7413120. Its totient is φ = 6546688.

The previous prime is 6978547. The next prime is 6978593. The reversal of 6978551 is 1558796.

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 6978551 - 2² = 6978547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6978499 and 6978508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6978511) 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 7 ways as a sum of consecutive naturals, for example, 7715 + ... + 8571.

It is an arithmetic number, because the mean of its divisors is an integer number (926640).

Almost surely, 2^6978551 is an apocalyptic number.

6978551 is a deficient number, since it is larger than the sum of its proper divisors (434569).

6978551 is a wasteful number, since it uses less digits than its factorization.

6978551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353.

The product of its digits is 75600, while the sum is 41.

The square root of 6978551 is about 2641.6947211970. The cubic root of 6978551 is about 191.0975352289.

The spelling of 6978551 in words is "six million, nine hundred seventy-eight thousand, five hundred fifty-one".