1609697 has 4 divisors (see below), whose sum is σ = 1637040. Its totient is φ = 1582356.

The previous prime is 1609693. The next prime is 1609717. The reversal of 1609697 is 7969061.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7969061 = 43 ⋅185327.

It is a cyclic number.

It is not a de Polignac number, because 1609697 - 2² = 1609693 is a prime.

It is a super-2 number, since 2×1609697² = 5182248863618, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 1609697.

It is not an unprimeable number, because it can be changed into a prime (1609691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13583 + ... + 13700.

It is an arithmetic number, because the mean of its divisors is an integer number (409260).

2^1609697 is an apocalyptic number.

It is an amenable number.

1609697 is a deficient number, since it is larger than the sum of its proper divisors (27343).

1609697 is an equidigital number, since it uses as much as digits as its factorization.

1609697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27342.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 1609697 is about 1268.7383497002. The cubic root of 1609697 is about 117.1965187844.

The spelling of 1609697 in words is "one million, six hundred nine thousand, six hundred ninety-seven".