630751409 has 2 divisors, whose sum is σ = 630751410. Its totient is φ = 630751408.

The previous prime is 630751403. The next prime is 630751489. The reversal of 630751409 is 904157036.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 628605184 + 2146225 = 25072^2 + 1465^2 .

It is a cyclic number.

It is not a de Polignac number, because 630751409 - 2²⁰ = 629702833 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (630751403) 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, 315375704 + 315375705.

It is an arithmetic number, because the mean of its divisors is an integer number (315375705).

Almost surely, 2^630751409 is an apocalyptic number.

It is an amenable number.

630751409 is a deficient number, since it is larger than the sum of its proper divisors (1).

630751409 is an equidigital number, since it uses as much as digits as its factorization.

630751409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 630751409 is about 25114.7647609927. The cubic root of 630751409 is about 857.6025752000.

The spelling of 630751409 in words is "six hundred thirty million, seven hundred fifty-one thousand, four hundred nine".