630009661 has 2 divisors, whose sum is σ = 630009662. Its totient is φ = 630009660.

The previous prime is 630009617. The next prime is 630009673. The reversal of 630009661 is 166900036.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 622752025 + 7257636 = 24955^2 + 2694^2 .

It is a cyclic number.

It is not a de Polignac number, because 630009661 - 2⁷ = 630009533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (630009161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315004830 + 315004831.

It is an arithmetic number, because the mean of its divisors is an integer number (315004831).

Almost surely, 2^630009661 is an apocalyptic number.

It is an amenable number.

630009661 is a deficient number, since it is larger than the sum of its proper divisors (1).

630009661 is an equidigital number, since it uses as much as digits as its factorization.

630009661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 630009661 is about 25099.9932470110. The cubic root of 630009661 is about 857.2662702233.

Adding to 630009661 its reverse (166900036), we get a palindrome (796909697).

The spelling of 630009661 in words is "six hundred thirty million, nine thousand, six hundred sixty-one".