6978091 has 2 divisors, whose sum is σ = 6978092. Its totient is φ = 6978090.

The previous prime is 6978061. The next prime is 6978113. The reversal of 6978091 is 1908796.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6978091 - 2¹³ = 6969899 is a prime.

It is not a weakly prime, because it can be changed into another prime (6978001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3489045 + 3489046.

It is an arithmetic number, because the mean of its divisors is an integer number (3489046).

Almost surely, 2^6978091 is an apocalyptic number.

6978091 is a deficient number, since it is larger than the sum of its proper divisors (1).

6978091 is an equidigital number, since it uses as much as digits as its factorization.

6978091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 6978091 is about 2641.6076544408. The cubic root of 6978091 is about 191.0933363248.

The spelling of 6978091 in words is "six million, nine hundred seventy-eight thousand, ninety-one".