630661601 has 2 divisors, whose sum is σ = 630661602. Its totient is φ = 630661600.

The previous prime is 630661567. The next prime is 630661609. The reversal of 630661601 is 106166036.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 444366400 + 186295201 = 21080^2 + 13649^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-630661601 is a prime.

It is not a weakly prime, because it can be changed into another prime (630661609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315330800 + 315330801.

It is an arithmetic number, because the mean of its divisors is an integer number (315330801).

Almost surely, 2^630661601 is an apocalyptic number.

It is an amenable number.

630661601 is a deficient number, since it is larger than the sum of its proper divisors (1).

630661601 is an equidigital number, since it uses as much as digits as its factorization.

630661601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 630661601 is about 25112.9767451013. The cubic root of 630661601 is about 857.5618707182.

The spelling of 630661601 in words is "six hundred thirty million, six hundred sixty-one thousand, six hundred one".