1303221 has 4 divisors (see below), whose sum is σ = 1737632. Its totient is φ = 868812.

The previous prime is 1303219. The next prime is 1303223. The reversal of 1303221 is 1223031.

It is a happy number.

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.

It is an interprime number because it is at equal distance from previous prime (1303219) and next prime (1303223).

It is not a de Polignac number, because 1303221 - 2¹ = 1303219 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1303197 and 1303206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1303223) 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, 217201 + ... + 217206.

It is an arithmetic number, because the mean of its divisors is an integer number (434408).

2^1303221 is an apocalyptic number.

It is an amenable number.

1303221 is a deficient number, since it is larger than the sum of its proper divisors (434411).

1303221 is an equidigital number, since it uses as much as digits as its factorization.

1303221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434410.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 1303221 is about 1141.5870531852. The cubic root of 1303221 is about 109.2293518222.

Adding to 1303221 its reverse (1223031), we get a palindrome (2526252).

The spelling of 1303221 in words is "one million, three hundred three thousand, two hundred twenty-one".