1609638125 has 10 divisors (see below), whose sum is σ = 2011404582. Its totient is φ = 1287710000.

The previous prime is 1609638119. The next prime is 1609638131. The reversal of 1609638125 is 5218369061.

It is an interprime number because it is at equal distance from previous prime (1609638119) and next prime (1609638131).

It can be written as a sum of positive squares in 5 ways, for example, as 288388324 + 1321249801 = 16982^2 + 36349^2 .

It is not a de Polignac number, because 1609638125 - 2²² = 1605443821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1287086 + ... + 1288335.

Almost surely, 2^1609638125 is an apocalyptic number.

It is an amenable number.

1609638125 is a deficient number, since it is larger than the sum of its proper divisors (401766457).

1609638125 is an frugal number, since it uses more digits than its factorization.

1609638125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575441 (or 2575426 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 1609638125 is about 40120.2956743841. The cubic root of 1609638125 is about 1171.9508993804.

The spelling of 1609638125 in words is "one billion, six hundred nine million, six hundred thirty-eight thousand, one hundred twenty-five".