606499981 has 2 divisors, whose sum is σ = 606499982. Its totient is φ = 606499980.

The previous prime is 606499961. The next prime is 606500009. The reversal of 606499981 is 189994606.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 535181956 + 71318025 = 23134^2 + 8445^2 .

It is a cyclic number.

It is not a de Polignac number, because 606499981 - 2⁷ = 606499853 is a prime.

It is a super-2 number, since 2×606499981² = 735684453906000722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (606499961) 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, 303249990 + 303249991.

It is an arithmetic number, because the mean of its divisors is an integer number (303249991).

Almost surely, 2^606499981 is an apocalyptic number.

It is an amenable number.

606499981 is a deficient number, since it is larger than the sum of its proper divisors (1).

606499981 is an equidigital number, since it uses as much as digits as its factorization.

606499981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 606499981 is about 24627.2203262975. The cubic root of 606499981 is about 846.4674527858.

The spelling of 606499981 in words is "six hundred six million, four hundred ninety-nine thousand, nine hundred eighty-one".