1906109 has 2 divisors, whose sum is σ = 1906110. Its totient is φ = 1906108.

The previous prime is 1906087. The next prime is 1906117. The reversal of 1906109 is 9016091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1898884 + 7225 = 1378^2 + 85^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1906109 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1906139) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 953054 + 953055.

It is an arithmetic number, because the mean of its divisors is an integer number (953055).

2^1906109 is an apocalyptic number.

It is an amenable number.

1906109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1906109 is an equidigital number, since it uses as much as digits as its factorization.

1906109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 1906109 is about 1380.6190640434. The cubic root of 1906109 is about 123.9888344091.

The spelling of 1906109 in words is "one million, nine hundred six thousand, one hundred nine".