606686621 has 2 divisors, whose sum is σ = 606686622. Its totient is φ = 606686620.

The previous prime is 606686569. The next prime is 606686653. The reversal of 606686621 is 126686606.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 432182521 + 174504100 = 20789^2 + 13210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-606686621 is a prime.

It is a super-2 number, since 2×606686621² = 736137312200795282, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (606685621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303343310 + 303343311.

It is an arithmetic number, because the mean of its divisors is an integer number (303343311).

Almost surely, 2^606686621 is an apocalyptic number.

It is an amenable number.

606686621 is a deficient number, since it is larger than the sum of its proper divisors (1).

606686621 is an equidigital number, since it uses as much as digits as its factorization.

606686621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 606686621 is about 24631.0093378245. The cubic root of 606686621 is about 846.5542725096.

The spelling of 606686621 in words is "six hundred six million, six hundred eighty-six thousand, six hundred twenty-one".