631689 has 8 divisors (see below), whose sum is σ = 847392. Its totient is φ = 418560.

The previous prime is 631681. The next prime is 631711. The reversal of 631689 is 986136.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 631689 - 2³ = 631681 is a prime.

631689 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (631681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34 + ... + 1124.

It is an arithmetic number, because the mean of its divisors is an integer number (105924).

2⁶³¹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

631689 is a deficient number, since it is larger than the sum of its proper divisors (215703).

631689 is a wasteful number, since it uses less digits than its factorization.

631689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287.

The product of its digits is 7776, while the sum is 33.

The square root of 631689 is about 794.7886511520. The cubic root of 631689 is about 85.8027297397.

The spelling of 631689 in words is "six hundred thirty-one thousand, six hundred eighty-nine".