631506 has 8 divisors (see below), whose sum is σ = 1263024. Its totient is φ = 210500.

The previous prime is 631487. The next prime is 631507. The reversal of 631506 is 605136.

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

631506 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (631507) by changing a digit.

631506 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52620 + ... + 52631.

It is an arithmetic number, because the mean of its divisors is an integer number (157878).

2⁶³¹⁵⁰⁶ is an apocalyptic number.

631506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631506 is a wasteful number, since it uses less digits than its factorization.

631506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105256.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 631506 is about 794.6735178676. The cubic root of 631506 is about 85.7944432695.

The spelling of 631506 in words is "six hundred thirty-one thousand, five hundred six".