1548221 has 2 divisors, whose sum is σ = 1548222. Its totient is φ = 1548220.

The previous prime is 1548187. The next prime is 1548247. The reversal of 1548221 is 1228451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1125721 + 422500 = 1061^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 1548221 - 2¹⁰ = 1547197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1548251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 774110 + 774111.

It is an arithmetic number, because the mean of its divisors is an integer number (774111).

2^1548221 is an apocalyptic number.

It is an amenable number.

1548221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1548221 is an equidigital number, since it uses as much as digits as its factorization.

1548221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 640, while the sum is 23.

The square root of 1548221 is about 1244.2752910831. The cubic root of 1548221 is about 115.6851599277.

The spelling of 1548221 in words is "one million, five hundred forty-eight thousand, two hundred twenty-one".