630615509 has 2 divisors, whose sum is σ = 630615510. Its totient is φ = 630615508.

The previous prime is 630615481. The next prime is 630615551. The reversal of 630615509 is 905516036.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 429401284 + 201214225 = 20722^2 + 14185^2 .

It is a cyclic number.

It is not a de Polignac number, because 630615509 - 2¹⁶ = 630549973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (630615599) 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, 315307754 + 315307755.

It is an arithmetic number, because the mean of its divisors is an integer number (315307755).

Almost surely, 2^630615509 is an apocalyptic number.

It is an amenable number.

630615509 is a deficient number, since it is larger than the sum of its proper divisors (1).

630615509 is an equidigital number, since it uses as much as digits as its factorization.

630615509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 630615509 is about 25112.0590354515. The cubic root of 630615509 is about 857.5409785288.

The spelling of 630615509 in words is "six hundred thirty million, six hundred fifteen thousand, five hundred nine".