1641001 has 4 divisors (see below), whose sum is σ = 1644292. Its totient is φ = 1637712.

The previous prime is 1640971. The next prime is 1641007. The reversal of 1641001 is 1001461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1001461 = 353 ⋅2837.

It can be written as a sum of positive squares in 2 ways, for example, as 15376 + 1625625 = 124^2 + 1275^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641001 - 2¹³ = 1632809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1641007) 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, 726 + ... + 1951.

It is an arithmetic number, because the mean of its divisors is an integer number (411073).

2^1641001 is an apocalyptic number.

It is an amenable number.

1641001 is a deficient number, since it is larger than the sum of its proper divisors (3291).

1641001 is an equidigital number, since it uses as much as digits as its factorization.

1641001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3290.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1641001 is about 1281.0156127074. The cubic root of 1641001 is about 117.9513588664.

Adding to 1641001 its reverse (1001461), we get a palindrome (2642462).

The spelling of 1641001 in words is "one million, six hundred forty-one thousand, one".