1307221 has 2 divisors, whose sum is σ = 1307222. Its totient is φ = 1307220.

The previous prime is 1307209. The next prime is 1307261. The reversal of 1307221 is 1227031.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1234321 + 72900 = 1111^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 1307221 - 2⁷ = 1307093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1307195 and 1307204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1307261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 653610 + 653611.

It is an arithmetic number, because the mean of its divisors is an integer number (653611).

2^1307221 is an apocalyptic number.

It is an amenable number.

1307221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1307221 is an equidigital number, since it uses as much as digits as its factorization.

1307221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 1307221 is about 1143.3376579121. The cubic root of 1307221 is about 109.3409908957.

The spelling of 1307221 in words is "one million, three hundred seven thousand, two hundred twenty-one".