1209001 has 4 divisors (see below), whose sum is σ = 1211392. Its totient is φ = 1206612.

The previous prime is 1208957. The next prime is 1209007. The reversal of 1209001 is 1009021.

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: 1009021 = 13 ⋅77617.

It is a cyclic number.

It is not a de Polignac number, because 1209001 - 2⁷ = 1208873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209007) 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, 105 + ... + 1558.

It is an arithmetic number, because the mean of its divisors is an integer number (302848).

2^1209001 is an apocalyptic number.

It is an amenable number.

1209001 is a deficient number, since it is larger than the sum of its proper divisors (2391).

1209001 is an equidigital number, since it uses as much as digits as its factorization.

1209001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2390.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1209001 is about 1099.5458153256. The cubic root of 1209001 is about 106.5308895241.

The spelling of 1209001 in words is "one million, two hundred nine thousand, one".