634320653 has 2 divisors, whose sum is σ = 634320654. Its totient is φ = 634320652.

The previous prime is 634320629. The next prime is 634320679. The reversal of 634320653 is 356023436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 440916004 + 193404649 = 20998^2 + 13907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634320653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634320613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317160326 + 317160327.

It is an arithmetic number, because the mean of its divisors is an integer number (317160327).

Almost surely, 2^634320653 is an apocalyptic number.

It is an amenable number.

634320653 is a deficient number, since it is larger than the sum of its proper divisors (1).

634320653 is an equidigital number, since it uses as much as digits as its factorization.

634320653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 32.

The square root of 634320653 is about 25185.7231978754. The cubic root of 634320653 is about 859.2171770440.

The spelling of 634320653 in words is "six hundred thirty-four million, three hundred twenty thousand, six hundred fifty-three".