1318609 has 2 divisors, whose sum is σ = 1318610. Its totient is φ = 1318608.

The previous prime is 1318579. The next prime is 1318633. The reversal of 1318609 is 9068131.

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., 1272384 + 46225 = 1128^2 + 215^2 .

It is an emirp because it is prime and its reverse (9068131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1318609 - 2¹³ = 1310417 is a prime.

It is not a weakly prime, because it can be changed into another prime (1318699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659304 + 659305.

It is an arithmetic number, because the mean of its divisors is an integer number (659305).

2^1318609 is an apocalyptic number.

It is an amenable number.

1318609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318609 is an equidigital number, since it uses as much as digits as its factorization.

1318609 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 1318609 is about 1148.3070146960. The cubic root of 1318609 is about 109.6575853547.

The spelling of 1318609 in words is "one million, three hundred eighteen thousand, six hundred nine".