1909129 has 2 divisors, whose sum is σ = 1909130. Its totient is φ = 1909128.

The previous prime is 1909121. The next prime is 1909147. The reversal of 1909129 is 9219091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1827904 + 81225 = 1352^2 + 285^2 .

It is a cyclic number.

It is not a de Polignac number, because 1909129 - 2³ = 1909121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1909129.

It is not a weakly prime, because it can be changed into another prime (1909121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954564 + 954565.

It is an arithmetic number, because the mean of its divisors is an integer number (954565).

2^1909129 is an apocalyptic number.

It is an amenable number.

1909129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909129 is an equidigital number, since it uses as much as digits as its factorization.

1909129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 1909129 is about 1381.7123434348. The cubic root of 1909129 is about 124.0542816455.

The spelling of 1909129 in words is "one million, nine hundred nine thousand, one hundred twenty-nine".