631601 has 8 divisors (see below), whose sum is σ = 682344. Its totient is φ = 582400.

The previous prime is 631597. The next prime is 631613. The reversal of 631601 is 106136.

It can be written as a sum of positive squares in 4 ways, for example, as 361201 + 270400 = 601^2 + 520^2 .

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 631601 - 2² = 631597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 631601.

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, 551 + ... + 1251.

It is an arithmetic number, because the mean of its divisors is an integer number (85293).

2⁶³¹⁶⁰¹ is an apocalyptic number.

It is an amenable number.

631601 is a deficient number, since it is larger than the sum of its proper divisors (50743).

631601 is a wasteful number, since it uses less digits than its factorization.

631601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 631601 is about 794.7332885944. The cubic root of 631601 is about 85.7987451888.

Adding to 631601 its reverse (106136), we get a palindrome (737737).

The spelling of 631601 in words is "six hundred thirty-one thousand, six hundred one".