1538066909 has 2 divisors, whose sum is σ = 1538066910. Its totient is φ = 1538066908.

The previous prime is 1538066851. The next prime is 1538066911. The reversal of 1538066909 is 9096608351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 843902500 + 694164409 = 29050^2 + 26347^2 .

It is a cyclic number.

It is not a de Polignac number, because 1538066909 - 2²⁰ = 1537018333 is a prime.

Together with 1538066911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1538066969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 769033454 + 769033455.

It is an arithmetic number, because the mean of its divisors is an integer number (769033455).

Almost surely, 2^1538066909 is an apocalyptic number.

It is an amenable number.

1538066909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1538066909 is an equidigital number, since it uses as much as digits as its factorization.

1538066909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 1538066909 is about 39218.1961466868. The cubic root of 1538066909 is about 1154.3169587624.

The spelling of 1538066909 in words is "one billion, five hundred thirty-eight million, sixty-six thousand, nine hundred nine".