1347221 has 2 divisors, whose sum is σ = 1347222. Its totient is φ = 1347220.

The previous prime is 1347211. The next prime is 1347223. The reversal of 1347221 is 1227431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 970225 + 376996 = 985^2 + 614^2 .

It is an emirp because it is prime and its reverse (1227431) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1347221 is a prime.

Together with 1347223, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1347193 and 1347202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1347223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 673610 + 673611.

It is an arithmetic number, because the mean of its divisors is an integer number (673611).

2^1347221 is an apocalyptic number.

It is an amenable number.

1347221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1347221 is an equidigital number, since it uses as much as digits as its factorization.

1347221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 20.

The square root of 1347221 is about 1160.6984965959. The cubic root of 1347221 is about 110.4450563921.

The spelling of 1347221 in words is "one million, three hundred forty-seven thousand, two hundred twenty-one".