630621653 has 4 divisors (see below), whose sum is σ = 630675180. Its totient is φ = 630568128.

The previous prime is 630621643. The next prime is 630621683. The reversal of 630621653 is 356126036.

630621653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 114105124 + 516516529 = 10682^2 + 22727^2 .

It is a cyclic number.

It is not a de Polignac number, because 630621653 - 2⁴ = 630621637 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 (630621643) 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, 500 + ... + 35517.

It is an arithmetic number, because the mean of its divisors is an integer number (157668795).

Almost surely, 2^630621653 is an apocalyptic number.

It is an amenable number.

630621653 is a deficient number, since it is larger than the sum of its proper divisors (53527).

630621653 is a wasteful number, since it uses less digits than its factorization.

630621653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53526.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 630621653 is about 25112.1813668188. The cubic root of 630621653 is about 857.5437634876.

Adding to 630621653 its reverse (356126036), we get a palindrome (986747689).

The spelling of 630621653 in words is "six hundred thirty million, six hundred twenty-one thousand, six hundred fifty-three".