1641859 has 4 divisors (see below), whose sum is σ = 1645200. Its totient is φ = 1638520.

The previous prime is 1641841. The next prime is 1641863. The reversal of 1641859 is 9581461.

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

It is a cyclic number.

It is not a de Polignac number, because 1641859 - 2¹¹ = 1639811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641889) 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, 772 + ... + 1969.

It is an arithmetic number, because the mean of its divisors is an integer number (411300).

2^1641859 is an apocalyptic number.

1641859 is a deficient number, since it is larger than the sum of its proper divisors (3341).

1641859 is an equidigital number, since it uses as much as digits as its factorization.

1641859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3340.

The product of its digits is 8640, while the sum is 34.

The square root of 1641859 is about 1281.3504594763. The cubic root of 1641859 is about 117.9719123036.

It can be divided in two parts, 1641 and 859, that added together give a square (2500 = 50²).

The spelling of 1641859 in words is "one million, six hundred forty-one thousand, eight hundred fifty-nine".