631659 has 12 divisors (see below), whose sum is σ = 979944. Its totient is φ = 360864.

The previous prime is 631643. The next prime is 631667. The reversal of 631659 is 956136.

It is a happy number.

It is not a de Polignac number, because 631659 - 2⁴ = 631643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631619) 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 in 11 ways as a sum of consecutive naturals, for example, 2002 + ... + 2295.

It is an arithmetic number, because the mean of its divisors is an integer number (81662).

2⁶³¹⁶⁵⁹ is an apocalyptic number.

631659 is a deficient number, since it is larger than the sum of its proper divisors (348285).

631659 is a wasteful number, since it uses less digits than its factorization.

631659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4314 (or 4307 counting only the distinct ones).

The product of its digits is 4860, while the sum is 30.

The square root of 631659 is about 794.7697779861. The cubic root of 631659 is about 85.8013714116.

The spelling of 631659 in words is "six hundred thirty-one thousand, six hundred fifty-nine".