631329 has 8 divisors (see below), whose sum is σ = 891360. Its totient is φ = 396096.

The previous prime is 631307. The next prime is 631339. The reversal of 631329 is 923136.

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

It is not a de Polignac number, because 631329 - 2¹¹ = 629281 is a prime.

631329 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 631299 and 631308.

It is not an unprimeable number, because it can be changed into a prime (631339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6139 + ... + 6240.

It is an arithmetic number, because the mean of its divisors is an integer number (111420).

2⁶³¹³²⁹ is an apocalyptic number.

It is an amenable number.

631329 is a deficient number, since it is larger than the sum of its proper divisors (260031).

631329 is a wasteful number, since it uses less digits than its factorization.

631329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12399.

The product of its digits is 972, while the sum is 24.

The square root of 631329 is about 794.5621435734. The cubic root of 631329 is about 85.7864269638.

The spelling of 631329 in words is "six hundred thirty-one thousand, three hundred twenty-nine".