1323556009 has 2 divisors, whose sum is σ = 1323556010. Its totient is φ = 1323556008.

The previous prime is 1323555983. The next prime is 1323556019. The reversal of 1323556009 is 9006553231.

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., 793267225 + 530288784 = 28165^2 + 23028^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323556009 - 2¹¹ = 1323553961 is a prime.

It is not a weakly prime, because it can be changed into another prime (1323556019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661778004 + 661778005.

It is an arithmetic number, because the mean of its divisors is an integer number (661778005).

Almost surely, 2^1323556009 is an apocalyptic number.

It is an amenable number.

1323556009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323556009 is an equidigital number, since it uses as much as digits as its factorization.

1323556009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 34.

The square root of 1323556009 is about 36380.7092976484. The cubic root of 1323556009 is about 1097.9454788384.

The spelling of 1323556009 in words is "one billion, three hundred twenty-three million, five hundred fifty-six thousand, nine".