630612521 has 8 divisors (see below), whose sum is σ = 786218304. Its totient is φ = 491386320.

The previous prime is 630612517. The next prime is 630612533. The reversal of 630612521 is 125216036.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 630612521 - 2² = 630612517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630612121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4094810 + ... + 4094963.

It is an arithmetic number, because the mean of its divisors is an integer number (98277288).

Almost surely, 2^630612521 is an apocalyptic number.

It is an amenable number.

630612521 is a deficient number, since it is larger than the sum of its proper divisors (155605783).

630612521 is a wasteful number, since it uses less digits than its factorization.

630612521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8189791.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 630612521 is about 25111.9995420516. Note that the first 3 decimals coincide. The cubic root of 630612521 is about 857.5396241185.

Adding to 630612521 its reverse (125216036), we get a palindrome (755828557).

The spelling of 630612521 in words is "six hundred thirty million, six hundred twelve thousand, five hundred twenty-one".