1909091 has 2 divisors, whose sum is σ = 1909092. Its totient is φ = 1909090.

The previous prime is 1909087. The next prime is 1909109.

1909091 is nontrivially palindromic in base 10.

Together with next prime (1909109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1909091 - 2² = 1909087 is a prime.

It is not a weakly prime, because it can be changed into another prime (1909021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954545 + 954546.

It is an arithmetic number, because the mean of its divisors is an integer number (954546).

2^1909091 is an apocalyptic number.

1909091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909091 is an equidigital number, since it uses as much as digits as its factorization.

1909091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 1909091 is about 1381.6985923131. The cubic root of 1909091 is about 124.0534585661.

The spelling of 1909091 in words is "one million, nine hundred nine thousand, ninety-one".