1609081 has 4 divisors (see below), whose sum is σ = 1611664. Its totient is φ = 1606500.

The previous prime is 1609079. The next prime is 1609087. The reversal of 1609081 is 1809061.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1809061 = 173 ⋅10457.

It is a cyclic number.

It is not a de Polignac number, because 1609081 - 2¹ = 1609079 is a prime.

It is a super-2 number, since 2×1609081² = 5178283329122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1609087) 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, 286 + ... + 1816.

It is an arithmetic number, because the mean of its divisors is an integer number (402916).

2^1609081 is an apocalyptic number.

It is an amenable number.

1609081 is a deficient number, since it is larger than the sum of its proper divisors (2583).

1609081 is a wasteful number, since it uses less digits than its factorization.

1609081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2582.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1609081 is about 1268.4955656209. The cubic root of 1609081 is about 117.1815672611.

The spelling of 1609081 in words is "one million, six hundred nine thousand, eighty-one".