631669 has 8 divisors (see below), whose sum is σ = 679320. Its totient is φ = 585216.

The previous prime is 631667. The next prime is 631679. The reversal of 631669 is 966136.

It can be written as a sum of positive squares in 4 ways, for example, as 289444 + 342225 = 538^2 + 585^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 631669 - 2¹ = 631667 is a prime.

It is a super-2 number, since 2×631669² = 798011451122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 631669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631667) 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 7 ways as a sum of consecutive naturals, for example, 987 + ... + 1495.

It is an arithmetic number, because the mean of its divisors is an integer number (84915).

2⁶³¹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

631669 is a deficient number, since it is larger than the sum of its proper divisors (47651).

631669 is a wasteful number, since it uses less digits than its factorization.

631669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599.

The product of its digits is 5832, while the sum is 31.

The square root of 631669 is about 794.7760690912. The cubic root of 631669 is about 85.8018241924.

The spelling of 631669 in words is "six hundred thirty-one thousand, six hundred sixty-nine".