1601585 has 4 divisors (see below), whose sum is σ = 1921908. Its totient is φ = 1281264.

The previous prime is 1601573. The next prime is 1601591. The reversal of 1601585 is 5851061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5851061 = 251 ⋅23311.

It can be written as a sum of positive squares in 2 ways, for example, as 889249 + 712336 = 943^2 + 844^2 .

It is a cyclic number.

It is not a de Polignac number, because 1601585 - 2⁴ = 1601569 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160154 + ... + 160163.

It is an arithmetic number, because the mean of its divisors is an integer number (480477).

2^1601585 is an apocalyptic number.

It is an amenable number.

1601585 is a deficient number, since it is larger than the sum of its proper divisors (320323).

1601585 is an equidigital number, since it uses as much as digits as its factorization.

1601585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320322.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1601585 is about 1265.5374352424. The cubic root of 1601585 is about 116.9993181834. Note that the first 3 decimals are identical.

The spelling of 1601585 in words is "one million, six hundred one thousand, five hundred eighty-five".