630256909 has 2 divisors, whose sum is σ = 630256910. Its totient is φ = 630256908.

The previous prime is 630256901. The next prime is 630256919. The reversal of 630256909 is 909652036.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 348755625 + 281501284 = 18675^2 + 16778^2 .

It is a cyclic number.

It is not a de Polignac number, because 630256909 - 2³ = 630256901 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 (630256901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315128454 + 315128455.

It is an arithmetic number, because the mean of its divisors is an integer number (315128455).

Almost surely, 2^630256909 is an apocalyptic number.

It is an amenable number.

630256909 is a deficient number, since it is larger than the sum of its proper divisors (1).

630256909 is an equidigital number, since it uses as much as digits as its factorization.

630256909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 630256909 is about 25104.9180241641. The cubic root of 630256909 is about 857.3784005933.

The spelling of 630256909 in words is "six hundred thirty million, two hundred fifty-six thousand, nine hundred nine".