1289001 has 8 divisors (see below), whose sum is σ = 1964224. Its totient is φ = 736560.

The previous prime is 1288997. The next prime is 1289003. The reversal of 1289001 is 1009821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1289001 - 2² = 1288997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 61381 = 1289001 / (1 + 2 + 8 + 9 + 0 + 0 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1289003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30670 + ... + 30711.

It is an arithmetic number, because the mean of its divisors is an integer number (245528).

2^1289001 is an apocalyptic number.

It is an amenable number.

1289001 is a deficient number, since it is larger than the sum of its proper divisors (675223).

1289001 is an equidigital number, since it uses as much as digits as its factorization.

1289001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61391.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1289001 is about 1135.3417987549. The cubic root of 1289001 is about 108.8306153480.

The spelling of 1289001 in words is "one million, two hundred eighty-nine thousand, one".