1011721 has 4 divisors (see below), whose sum is σ = 1071252. Its totient is φ = 952192.

The previous prime is 1011719. The next prime is 1011733. The reversal of 1011721 is 1271101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1271101 = 13 ⋅97777.

It can be written as a sum of positive squares in 2 ways, for example, as 270400 + 741321 = 520^2 + 861^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011721 - 2¹ = 1011719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011221) 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, 29740 + ... + 29773.

It is an arithmetic number, because the mean of its divisors is an integer number (267813).

2^1011721 is an apocalyptic number.

It is an amenable number.

1011721 is a deficient number, since it is larger than the sum of its proper divisors (59531).

1011721 is an equidigital number, since it uses as much as digits as its factorization.

1011721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59530.

The product of its (nonzero) digits is 14, while the sum is 13.

The square root of 1011721 is about 1005.8434271794. The cubic root of 1011721 is about 100.3891833979.

Adding to 1011721 its reverse (1271101), we get a palindrome (2282822).

The spelling of 1011721 in words is "one million, eleven thousand, seven hundred twenty-one".