630865253 has 4 divisors (see below), whose sum is σ = 631022028. Its totient is φ = 630708480.

The previous prime is 630865247. The next prime is 630865267. The reversal of 630865253 is 352568036.

It is a happy number.

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 196476289 + 434388964 = 14017^2 + 20842^2 .

It is a cyclic number.

It is not a de Polignac number, because 630865253 - 2²⁸ = 362429797 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 (630865243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72188 + ... + 80453.

It is an arithmetic number, because the mean of its divisors is an integer number (157755507).

Almost surely, 2^630865253 is an apocalyptic number.

It is an amenable number.

630865253 is a deficient number, since it is larger than the sum of its proper divisors (156775).

630865253 is a wasteful number, since it uses less digits than its factorization.

630865253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156774.

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 630865253 is about 25117.0311342722. The cubic root of 630865253 is about 857.6541681799.

The spelling of 630865253 in words is "six hundred thirty million, eight hundred sixty-five thousand, two hundred fifty-three".