1609396889 has 4 divisors (see below), whose sum is σ = 1643639424. Its totient is φ = 1575154356.

The previous prime is 1609396861. The next prime is 1609396891. The reversal of 1609396889 is 9886939061.

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 1609396889 - 2¹² = 1609392793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1609396849) 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, 17121197 + ... + 17121290.

It is an arithmetic number, because the mean of its divisors is an integer number (410909856).

Almost surely, 2^1609396889 is an apocalyptic number.

It is an amenable number.

1609396889 is a deficient number, since it is larger than the sum of its proper divisors (34242535).

1609396889 is an equidigital number, since it uses as much as digits as its factorization.

1609396889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34242534.

The product of its (nonzero) digits is 5038848, while the sum is 59.

The square root of 1609396889 is about 40117.2891531818. The cubic root of 1609396889 is about 1171.8923498080.

The spelling of 1609396889 in words is "one billion, six hundred nine million, three hundred ninety-six thousand, eight hundred eighty-nine".