634859 has 2 divisors, whose sum is σ = 634860. Its totient is φ = 634858.

The previous prime is 634853. The next prime is 634861. The reversal of 634859 is 958436.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 634859 - 2⁸ = 634603 is a prime.

Together with 634861, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (634853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317429 + 317430.

It is an arithmetic number, because the mean of its divisors is an integer number (317430).

2⁶³⁴⁸⁵⁹ is an apocalyptic number.

634859 is a deficient number, since it is larger than the sum of its proper divisors (1).

634859 is an equidigital number, since it uses as much as digits as its factorization.

634859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The square root of 634859 is about 796.7803963452. The cubic root of 634859 is about 85.9460180427.

The spelling of 634859 in words is "six hundred thirty-four thousand, eight hundred fifty-nine".