1606326221 has 2 divisors, whose sum is σ = 1606326222. Its totient is φ = 1606326220.

The previous prime is 1606326203. The next prime is 1606326257. The reversal of 1606326221 is 1226236061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1562620900 + 43705321 = 39530^2 + 6611^2 .

It is a cyclic number.

It is not a de Polignac number, because 1606326221 - 2¹⁸ = 1606064077 is a prime.

It is a super-3 number, since 3×1606326221³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1606328221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803163110 + 803163111.

It is an arithmetic number, because the mean of its divisors is an integer number (803163111).

Almost surely, 2^1606326221 is an apocalyptic number.

It is an amenable number.

1606326221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606326221 is an equidigital number, since it uses as much as digits as its factorization.

1606326221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1606326221 is about 40078.9997504928. Note that the first 3 decimals coincide. The cubic root of 1606326221 is about 1171.1465666335.

The spelling of 1606326221 in words is "one billion, six hundred six million, three hundred twenty-six thousand, two hundred twenty-one".