1606641 has 4 divisors (see below), whose sum is σ = 2142192. Its totient is φ = 1071092.

The previous prime is 1606639. The next prime is 1606643. The reversal of 1606641 is 1466061.

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 an emirpimes, since its reverse is a distinct semiprime: 1466061 = 3 ⋅488687.

It is an interprime number because it is at equal distance from previous prime (1606639) and next prime (1606643).

It is a cyclic number.

It is not a de Polignac number, because 1606641 - 2¹ = 1606639 is a prime.

It is a D-number.

It is a Curzon number.

1606641 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1606643) 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, 267771 + ... + 267776.

It is an arithmetic number, because the mean of its divisors is an integer number (535548).

2^1606641 is an apocalyptic number.

It is an amenable number.

1606641 is a deficient number, since it is larger than the sum of its proper divisors (535551).

1606641 is an equidigital number, since it uses as much as digits as its factorization.

1606641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535550.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1606641 is about 1267.5334315118. The cubic root of 1606641 is about 117.1223061736.

The spelling of 1606641 in words is "one million, six hundred six thousand, six hundred forty-one".