606636581 has 2 divisors, whose sum is σ = 606636582. Its totient is φ = 606636580.

The previous prime is 606636577. The next prime is 606636623. The reversal of 606636581 is 185636606.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 332734081 + 273902500 = 18241^2 + 16550^2 .

It is a cyclic number.

It is not a de Polignac number, because 606636581 - 2² = 606636577 is a prime.

It is a super-2 number, since 2×606636581² = 736015882814739122, 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 (606636281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303318290 + 303318291.

It is an arithmetic number, because the mean of its divisors is an integer number (303318291).

Almost surely, 2^606636581 is an apocalyptic number.

It is an amenable number.

606636581 is a deficient number, since it is larger than the sum of its proper divisors (1).

606636581 is an equidigital number, since it uses as much as digits as its factorization.

606636581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 606636581 is about 24629.9935241567. The cubic root of 606636581 is about 846.5309970441.

The spelling of 606636581 in words is "six hundred six million, six hundred thirty-six thousand, five hundred eighty-one".