1290109 has 2 divisors, whose sum is σ = 1290110. Its totient is φ = 1290108.

The previous prime is 1290083. The next prime is 1290131. The reversal of 1290109 is 9010921.

It is an a-pointer prime, because the next prime (1290131) can be obtained adding 1290109 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 727609 + 562500 = 853^2 + 750^2 .

It is a cyclic number.

It is not a de Polignac number, because 1290109 - 2⁵ = 1290077 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 1290109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1290169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645054 + 645055.

It is an arithmetic number, because the mean of its divisors is an integer number (645055).

2^1290109 is an apocalyptic number.

It is an amenable number.

1290109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1290109 is an equidigital number, since it uses as much as digits as its factorization.

1290109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 1290109 is about 1135.8296527209. The cubic root of 1290109 is about 108.8617893057.

The spelling of 1290109 in words is "one million, two hundred ninety thousand, one hundred nine".