1608881 has 4 divisors (see below), whose sum is σ = 1648164. Its totient is φ = 1569600.

The previous prime is 1608839. The next prime is 1608883. The reversal of 1608881 is 1888061.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1888061 = 7 ⋅269723.

It can be written as a sum of positive squares in 2 ways, for example, as 207025 + 1401856 = 455^2 + 1184^2 .

It is a cyclic number.

It is not a de Polignac number, because 1608881 - 2¹⁰ = 1607857 is a prime.

It is a super-2 number, since 2×1608881² = 5176996144322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1608883) 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, 19580 + ... + 19661.

It is an arithmetic number, because the mean of its divisors is an integer number (412041).

2^1608881 is an apocalyptic number.

It is an amenable number.

1608881 is a deficient number, since it is larger than the sum of its proper divisors (39283).

1608881 is an equidigital number, since it uses as much as digits as its factorization.

1608881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39282.

The product of its (nonzero) digits is 3072, while the sum is 32.

The square root of 1608881 is about 1268.4167296279. The cubic root of 1608881 is about 117.1767120499.

The spelling of 1608881 in words is "one million, six hundred eight thousand, eight hundred eighty-one".