1361809 has 2 divisors, whose sum is σ = 1361810. Its totient is φ = 1361808.

The previous prime is 1361803. The next prime is 1361813. The reversal of 1361809 is 9081631.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1329409 + 32400 = 1153^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 1361809 - 2⁵ = 1361777 is a prime.

It is not a weakly prime, because it can be changed into another prime (1361803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680904 + 680905.

It is an arithmetic number, because the mean of its divisors is an integer number (680905).

2^1361809 is an apocalyptic number.

It is an amenable number.

1361809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361809 is an equidigital number, since it uses as much as digits as its factorization.

1361809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1361809 is about 1166.9657235755. The cubic root of 1361809 is about 110.8422671048.

The spelling of 1361809 in words is "one million, three hundred sixty-one thousand, eight hundred nine".