1609782449 has 4 divisors (see below), whose sum is σ = 1756126320. Its totient is φ = 1463438580.

The previous prime is 1609782407. The next prime is 1609782463. The reversal of 1609782449 is 9442879061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1609782449 - 2⁸ = 1609782193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1609782397 and 1609782406.

It is not an unprimeable number, because it can be changed into a prime (1609781449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73171919 + ... + 73171940.

It is an arithmetic number, because the mean of its divisors is an integer number (439031580).

Almost surely, 2^1609782449 is an apocalyptic number.

It is an amenable number.

1609782449 is a deficient number, since it is larger than the sum of its proper divisors (146343871).

1609782449 is a wasteful number, since it uses less digits than its factorization.

1609782449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146343870.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 1609782449 is about 40122.0942748506. The cubic root of 1609782449 is about 1171.9859249728.

The spelling of 1609782449 in words is "one billion, six hundred nine million, seven hundred eighty-two thousand, four hundred forty-nine".