603666989 has 2 divisors, whose sum is σ = 603666990. Its totient is φ = 603666988.

The previous prime is 603666977. The next prime is 603667027. The reversal of 603666989 is 989666306.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 602309764 + 1357225 = 24542^2 + 1165^2 .

It is a cyclic number.

It is not a de Polignac number, because 603666989 - 2²⁴ = 586889773 is a prime.

It is a super-2 number, since 2×603666989² = 728827667216652242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 603666989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (603666389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 301833494 + 301833495.

It is an arithmetic number, because the mean of its divisors is an integer number (301833495).

Almost surely, 2^603666989 is an apocalyptic number.

It is an amenable number.

603666989 is a deficient number, since it is larger than the sum of its proper divisors (1).

603666989 is an equidigital number, since it uses as much as digits as its factorization.

603666989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424, while the sum is 53.

The square root of 603666989 is about 24569.6355080819. The cubic root of 603666989 is about 845.1474312973.

The spelling of 603666989 in words is "six hundred three million, six hundred sixty-six thousand, nine hundred eighty-nine".