1080921 has 4 divisors (see below), whose sum is σ = 1441232. Its totient is φ = 720612.

The previous prime is 1080913. The next prime is 1080923. The reversal of 1080921 is 1290801.

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: 1290801 = 3 ⋅430267.

It is not a de Polignac number, because 1080921 - 2³ = 1080913 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1080923) 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 3 ways as a sum of consecutive naturals, for example, 180151 + ... + 180156.

It is an arithmetic number, because the mean of its divisors is an integer number (360308).

2^1080921 is an apocalyptic number.

It is an amenable number.

1080921 is a deficient number, since it is larger than the sum of its proper divisors (360311).

1080921 is an equidigital number, since it uses as much as digits as its factorization.

1080921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360310.

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

The square root of 1080921 is about 1039.6735064432. The cubic root of 1080921 is about 102.6277131040.

The spelling of 1080921 in words is "one million, eighty thousand, nine hundred twenty-one".