1031221 has 4 divisors (see below), whose sum is σ = 1050732. Its totient is φ = 1011712.

The previous prime is 1031189. The next prime is 1031231. The reversal of 1031221 is 1221301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1221301 = 19 ⋅64279.

It can be written as a sum of positive squares in 2 ways, for example, as 792100 + 239121 = 890^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 1031221 - 2⁵ = 1031189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1031198 and 1031207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9676 + ... + 9781.

It is an arithmetic number, because the mean of its divisors is an integer number (262683).

2^1031221 is an apocalyptic number.

It is an amenable number.

1031221 is a deficient number, since it is larger than the sum of its proper divisors (19511).

1031221 is an equidigital number, since it uses as much as digits as its factorization.

1031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19510.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1031221 is about 1015.4905218662. The cubic root of 1031221 is about 101.0300534686.

Adding to 1031221 its reverse (1221301), we get a palindrome (2252522).

The spelling of 1031221 in words is "one million, thirty-one thousand, two hundred twenty-one".