1538609 has 2 divisors, whose sum is σ = 1538610. Its totient is φ = 1538608.

The previous prime is 1538599. The next prime is 1538611. The reversal of 1538609 is 9068351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1507984 + 30625 = 1228^2 + 175^2 .

It is an emirp because it is prime and its reverse (9068351) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1538609 - 2⁸ = 1538353 is a prime.

Together with 1538611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1538629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 769304 + 769305.

It is an arithmetic number, because the mean of its divisors is an integer number (769305).

2^1538609 is an apocalyptic number.

It is an amenable number.

1538609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1538609 is an equidigital number, since it uses as much as digits as its factorization.

1538609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1538609 is about 1240.4067881143. The cubic root of 1538609 is about 115.4452555667.

The spelling of 1538609 in words is "one million, five hundred thirty-eight thousand, six hundred nine".