631242 has 12 divisors (see below), whose sum is σ = 1367730. Its totient is φ = 210408.

The previous prime is 631229. The next prime is 631247. The reversal of 631242 is 242136.

It is a happy number.

631242 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in only one way, i.e., 349281 + 281961 = 591^2 + 531^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 35069 = 631242 / (6 + 3 + 1 + 2 + 4 + 2).

It is not an unprimeable number, because it can be changed into a prime (631247) by changing a digit.

631242 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 5 ways as a sum of consecutive naturals, for example, 17517 + ... + 17552.

2⁶³¹²⁴² is an apocalyptic number.

631242 is an abundant number, since it is smaller than the sum of its proper divisors (736488).

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

631242 is a wasteful number, since it uses less digits than its factorization.

631242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35077 (or 35074 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 631242 is about 794.5073945534. The cubic root of 631242 is about 85.7824861966.

Adding to 631242 its reverse (242136), we get a palindrome (873378).

The spelling of 631242 in words is "six hundred thirty-one thousand, two hundred forty-two".