1669001 has 4 divisors (see below), whose sum is σ = 1678404. Its totient is φ = 1659600.

The previous prime is 1668983. The next prime is 1669027. The reversal of 1669001 is 1009661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1009661 = 229 ⋅4409.

It can be written as a sum of positive squares in 2 ways, for example, as 678976 + 990025 = 824^2 + 995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669001 - 2¹⁴ = 1652617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1669061) 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, 4430 + ... + 4791.

It is an arithmetic number, because the mean of its divisors is an integer number (419601).

2^1669001 is an apocalyptic number.

It is an amenable number.

1669001 is a deficient number, since it is larger than the sum of its proper divisors (9403).

1669001 is an equidigital number, since it uses as much as digits as its factorization.

1669001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9402.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 1669001 is about 1291.8982158049. The cubic root of 1669001 is about 118.6184374912.

The spelling of 1669001 in words is "one million, six hundred sixty-nine thousand, one".