1608581 has 4 divisors (see below), whose sum is σ = 1732332. Its totient is φ = 1484832.

The previous prime is 1608577. The next prime is 1608583. The reversal of 1608581 is 1858061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 919681 + 688900 = 959^2 + 830^2 .

It is a cyclic number.

It is not a de Polignac number, because 1608581 - 2² = 1608577 is a prime.

It is a super-2 number, since 2×1608581² = 5175065667122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1608583) 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, 61856 + ... + 61881.

It is an arithmetic number, because the mean of its divisors is an integer number (433083).

2^1608581 is an apocalyptic number.

It is an amenable number.

1608581 is a deficient number, since it is larger than the sum of its proper divisors (123751).

1608581 is a wasteful number, since it uses less digits than its factorization.

1608581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123750.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 1608581 is about 1268.2984664502. The cubic root of 1608581 is about 117.1694284785.

The spelling of 1608581 in words is "one million, six hundred eight thousand, five hundred eighty-one".