634679 has 2 divisors, whose sum is σ = 634680. Its totient is φ = 634678.

The previous prime is 634651. The next prime is 634681. The reversal of 634679 is 976436.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 634679 - 2¹² = 630583 is a prime.

Together with 634681, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634609) 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 as a sum of consecutive naturals, namely, 317339 + 317340.

It is an arithmetic number, because the mean of its divisors is an integer number (317340).

2⁶³⁴⁶⁷⁹ is an apocalyptic number.

634679 is a deficient number, since it is larger than the sum of its proper divisors (1).

634679 is an equidigital number, since it uses as much as digits as its factorization.

634679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 35.

The square root of 634679 is about 796.6674337514. The cubic root of 634679 is about 85.9378945877.

The spelling of 634679 in words is "six hundred thirty-four thousand, six hundred seventy-nine".