630805513 has 6 divisors (see below), whose sum is σ = 683061774. Its totient is φ = 582281856.

The previous prime is 630805507. The next prime is 630805559. The reversal of 630805513 is 315508036.

It can be written as a sum of positive squares in 3 ways, for example, as 37785609 + 593019904 = 6147^2 + 24352^2 .

It is a de Polignac number, because none of the positive numbers 2^k-630805513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630808513) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1866120 + ... + 1866457.

It is an arithmetic number, because the mean of its divisors is an integer number (113843629).

Almost surely, 2^630805513 is an apocalyptic number.

It is an amenable number.

630805513 is a deficient number, since it is larger than the sum of its proper divisors (52256261).

630805513 is a wasteful number, since it uses less digits than its factorization.

630805513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3732603 (or 3732590 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 630805513 is about 25115.8418732082. The cubic root of 630805513 is about 857.6270953741.

The spelling of 630805513 in words is "six hundred thirty million, eight hundred five thousand, five hundred thirteen".