630845813 has 4 divisors (see below), whose sum is σ = 679372428. Its totient is φ = 582319200.

The previous prime is 630845777. The next prime is 630845833. The reversal of 630845813 is 318548036.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 426298609 + 204547204 = 20647^2 + 14302^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-630845813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630845833) 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 in 3 ways as a sum of consecutive naturals, for example, 24263288 + ... + 24263313.

It is an arithmetic number, because the mean of its divisors is an integer number (169843107).

Almost surely, 2^630845813 is an apocalyptic number.

It is an amenable number.

630845813 is a deficient number, since it is larger than the sum of its proper divisors (48526615).

630845813 is a wasteful number, since it uses less digits than its factorization.

630845813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48526614.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 630845813 is about 25116.6441428786. The cubic root of 630845813 is about 857.6453586027.

The spelling of 630845813 in words is "six hundred thirty million, eight hundred forty-five thousand, eight hundred thirteen".