1608681 has 4 divisors (see below), whose sum is σ = 2144912. Its totient is φ = 1072452.

The previous prime is 1608671. The next prime is 1608697. The reversal of 1608681 is 1868061.

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 not a de Polignac number, because 1608681 - 2⁶ = 1608617 is a prime.

It is a super-2 number, since 2×1608681² = 5175709119522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1608611) 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, 268111 + ... + 268116.

It is an arithmetic number, because the mean of its divisors is an integer number (536228).

2^1608681 is an apocalyptic number.

It is an amenable number.

1608681 is a deficient number, since it is larger than the sum of its proper divisors (536231).

1608681 is an equidigital number, since it uses as much as digits as its factorization.

1608681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536230.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1608681 is about 1268.3378887347. The cubic root of 1608681 is about 117.1718564363.

The spelling of 1608681 in words is "one million, six hundred eight thousand, six hundred eighty-one".