1536221 has 2 divisors, whose sum is σ = 1536222. Its totient is φ = 1536220.

The previous prime is 1536211. The next prime is 1536251. The reversal of 1536221 is 1226351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1413721 + 122500 = 1189^2 + 350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1536221 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1536193 and 1536202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1536211) 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 as a sum of consecutive naturals, namely, 768110 + 768111.

It is an arithmetic number, because the mean of its divisors is an integer number (768111).

2^1536221 is an apocalyptic number.

It is an amenable number.

1536221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1536221 is an equidigital number, since it uses as much as digits as its factorization.

1536221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 20.

The square root of 1536221 is about 1239.4438268837. The cubic root of 1536221 is about 115.3854989904.

The spelling of 1536221 in words is "one million, five hundred thirty-six thousand, two hundred twenty-one".