631255 has 8 divisors (see below), whose sum is σ = 762624. Its totient is φ = 501600.

The previous prime is 631249. The next prime is 631259. The reversal of 631255 is 552136.

It is a happy number.

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

It is not a de Polignac number, because 631255 - 2³ = 631247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631259) 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, 625 + ... + 1285.

It is an arithmetic number, because the mean of its divisors is an integer number (95328).

2⁶³¹²⁵⁵ is an apocalyptic number.

631255 is a deficient number, since it is larger than the sum of its proper divisors (131369).

631255 is a wasteful number, since it uses less digits than its factorization.

631255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857.

The product of its digits is 900, while the sum is 22.

The square root of 631255 is about 794.5155756812. The cubic root of 631255 is about 85.7830750699.

The spelling of 631255 in words is "six hundred thirty-one thousand, two hundred fifty-five".