631542 has 16 divisors (see below), whose sum is σ = 1282752.
Its totient is φ = 207240.
The previous prime is 631537. The next prime is 631549. The reversal of 631542 is 245136.
It is a happy number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (631549) by changing a digit.
631542 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
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, 384 + ... + 1187.
It is an arithmetic number, because the mean of its divisors is an integer number (80172).
2631542 is an apocalyptic number.
631542 is an abundant number, since it is smaller than the sum of its proper divisors (651210).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
631542 is a wasteful number, since it uses less digits than its factorization.
631542 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1643.
The product of its digits is 720, while the sum is 21.
The square root of 631542 is about 794.6961683562.
The cubic root of 631542 is about 85.7960735213.
Adding to 631542 its reverse (245136), we get a palindrome (876678).
The spelling of 631542 in words is "six hundred thirty-one thousand, five hundred forty-two".