634817 has 2 divisors, whose sum is σ = 634818. Its totient is φ = 634816.

The previous prime is 634807. The next prime is 634841. The reversal of 634817 is 718436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 579121 + 55696 = 761^2 + 236^2 .

It is a cyclic number.

It is not a de Polignac number, because 634817 - 2¹⁰ = 633793 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 634817.

It is not a weakly prime, because it can be changed into another prime (634807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317408 + 317409.

It is an arithmetic number, because the mean of its divisors is an integer number (317409).

2⁶³⁴⁸¹⁷ is an apocalyptic number.

It is an amenable number.

634817 is a deficient number, since it is larger than the sum of its proper divisors (1).

634817 is an equidigital number, since it uses as much as digits as its factorization.

634817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 29.

The square root of 634817 is about 796.7540398391. The cubic root of 634817 is about 85.9441227072.

The spelling of 634817 in words is "six hundred thirty-four thousand, eight hundred seventeen".