630689 has 2 divisors, whose sum is σ = 630690. Its totient is φ = 630688.

The previous prime is 630677. The next prime is 630701. The reversal of 630689 is 986036.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (630677) and next prime (630701).

It can be written as a sum of positive squares in only one way, i.e., 380689 + 250000 = 617^2 + 500^2 .

It is a cyclic number.

It is not a de Polignac number, because 630689 - 2⁸ = 630433 is a prime.

It is a super-2 number, since 2×630689² = 795537229442, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (630659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315344 + 315345.

It is an arithmetic number, because the mean of its divisors is an integer number (315345).

2⁶³⁰⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

630689 is a deficient number, since it is larger than the sum of its proper divisors (1).

630689 is an equidigital number, since it uses as much as digits as its factorization.

630689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 630689 is about 794.1593039183. The cubic root of 630689 is about 85.7574289421.

The spelling of 630689 in words is "six hundred thirty thousand, six hundred eighty-nine".