1609659538 has 8 divisors (see below), whose sum is σ = 2415206988. Its totient is φ = 804590544.

The previous prime is 1609659533. The next prime is 1609659553. The reversal of 1609659538 is 8359569061.

It can be written as a sum of positive squares in 2 ways, for example, as 1605845329 + 3814209 = 40073^2 + 1953^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1609659533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111081 + ... + 124732.

Almost surely, 2^1609659538 is an apocalyptic number.

1609659538 is a deficient number, since it is larger than the sum of its proper divisors (805547450).

1609659538 is a wasteful number, since it uses less digits than its factorization.

1609659538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239228.

The product of its (nonzero) digits is 1749600, while the sum is 52.

The square root of 1609659538 is about 40120.5625334441. The cubic root of 1609659538 is about 1171.9560961744.

The spelling of 1609659538 in words is "one billion, six hundred nine million, six hundred fifty-nine thousand, five hundred thirty-eight".