631859 has 2 divisors, whose sum is σ = 631860. Its totient is φ = 631858.

The previous prime is 631853. The next prime is 631861. The reversal of 631859 is 958136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 631859 - 2⁴ = 631843 is a prime.

Together with 631861, 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 (631853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315929 + 315930.

It is an arithmetic number, because the mean of its divisors is an integer number (315930).

2⁶³¹⁸⁵⁹ is an apocalyptic number.

631859 is a deficient number, since it is larger than the sum of its proper divisors (1).

631859 is an equidigital number, since it uses as much as digits as its factorization.

631859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 32.

The square root of 631859 is about 794.8955906281. The cubic root of 631859 is about 85.8104261197.

The spelling of 631859 in words is "six hundred thirty-one thousand, eight hundred fifty-nine".