6661091 has 2 divisors, whose sum is σ = 6661092. Its totient is φ = 6661090.

The previous prime is 6661079. The next prime is 6661103. The reversal of 6661091 is 1901666.

6661091 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (6661079) and next prime (6661103).

It is a cyclic number.

It is not a de Polignac number, because 6661091 - 2²² = 2466787 is a prime.

It is not a weakly prime, because it can be changed into another prime (6661021) 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, 3330545 + 3330546.

It is an arithmetic number, because the mean of its divisors is an integer number (3330546).

Almost surely, 2^6661091 is an apocalyptic number.

6661091 is a deficient number, since it is larger than the sum of its proper divisors (1).

6661091 is an equidigital number, since it uses as much as digits as its factorization.

6661091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 6661091 is about 2580.9089484133. The cubic root of 6661091 is about 188.1547221097.

The spelling of 6661091 in words is "six million, six hundred sixty-one thousand, ninety-one".