606938221 has 2 divisors, whose sum is σ = 606938222. Its totient is φ = 606938220.

The previous prime is 606938219. The next prime is 606938231. The reversal of 606938221 is 122839606.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 328515625 + 278422596 = 18125^2 + 16686^2 .

It is a cyclic number.

It is not a de Polignac number, because 606938221 - 2¹ = 606938219 is a prime.

It is a super-2 number, since 2×606938221² = 736748008221289682, which contains 22 as substring.

Together with 606938219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (606938231) 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, 303469110 + 303469111.

It is an arithmetic number, because the mean of its divisors is an integer number (303469111).

Almost surely, 2^606938221 is an apocalyptic number.

It is an amenable number.

606938221 is a deficient number, since it is larger than the sum of its proper divisors (1).

606938221 is an equidigital number, since it uses as much as digits as its factorization.

606938221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 606938221 is about 24636.1161914779. The cubic root of 606938221 is about 846.6712816380.

The spelling of 606938221 in words is "six hundred six million, nine hundred thirty-eight thousand, two hundred twenty-one".