606647221 has 2 divisors, whose sum is σ = 606647222. Its totient is φ = 606647220.

The previous prime is 606647213. The next prime is 606647233. The reversal of 606647221 is 122746606.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588062500 + 18584721 = 24250^2 + 4311^2 .

It is a cyclic number.

It is not a de Polignac number, because 606647221 - 2³ = 606647213 is a prime.

It is equal to p_31653772 and since 606647221 and 31653772 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (606647281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303323610 + 303323611.

It is an arithmetic number, because the mean of its divisors is an integer number (303323611).

Almost surely, 2^606647221 is an apocalyptic number.

It is an amenable number.

606647221 is a deficient number, since it is larger than the sum of its proper divisors (1).

606647221 is an equidigital number, since it uses as much as digits as its factorization.

606647221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 606647221 is about 24630.2095200183. The cubic root of 606647221 is about 846.5359462110.

The spelling of 606647221 in words is "six hundred six million, six hundred forty-seven thousand, two hundred twenty-one".