1609281605 has 16 divisors (see below), whose sum is σ = 1972724544. Its totient is φ = 1259992320.

The previous prime is 1609281593. The next prime is 1609281607. The reversal of 1609281605 is 5061829061.

It is not a de Polignac number, because 1609281605 - 2¹⁴ = 1609265221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1609281607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26285 + ... + 62525.

It is an arithmetic number, because the mean of its divisors is an integer number (123295284).

Almost surely, 2^1609281605 is an apocalyptic number.

It is an amenable number.

1609281605 is a deficient number, since it is larger than the sum of its proper divisors (363442939).

1609281605 is a wasteful number, since it uses less digits than its factorization.

1609281605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36436.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 1609281605 is about 40115.8522905846. The cubic root of 1609281605 is about 1171.8643675527.

The spelling of 1609281605 in words is "one billion, six hundred nine million, two hundred eighty-one thousand, six hundred five".