631998 has 12 divisors (see below), whose sum is σ = 1369368. Its totient is φ = 210660.

The previous prime is 631993. The next prime is 632029. The reversal of 631998 is 899136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631991) 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 5 ways as a sum of consecutive naturals, for example, 17538 + ... + 17573.

It is an arithmetic number, because the mean of its divisors is an integer number (114114).

2⁶³¹⁹⁹⁸ is an apocalyptic number.

631998 is an abundant number, since it is smaller than the sum of its proper divisors (737370).

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

631998 is a wasteful number, since it uses less digits than its factorization.

631998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35119 (or 35116 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 631998 is about 794.9830186866. The cubic root of 631998 is about 85.8167180164.

The spelling of 631998 in words is "six hundred thirty-one thousand, nine hundred ninety-eight".