631722 has 48 divisors (see below), whose sum is σ = 1581120. Its totient is φ = 164736.

The previous prime is 631717. The next prime is 631723. The reversal of 631722 is 227136.

It is a happy number.

631722 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (631723) by changing a digit.

631722 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 23 ways as a sum of consecutive naturals, for example, 7054 + ... + 7142.

It is an arithmetic number, because the mean of its divisors is an integer number (32940).

2⁶³¹⁷²² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (790560).

631722 is an abundant number, since it is smaller than the sum of its proper divisors (949398).

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

631722 is a wasteful number, since it uses less digits than its factorization.

631722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 114 counting only the distinct ones).

The product of its digits is 504, while the sum is 21.

The square root of 631722 is about 794.8094111169. The cubic root of 631722 is about 85.8042238508.

Adding to 631722 its reverse (227136), we get a palindrome (858858).

The spelling of 631722 in words is "six hundred thirty-one thousand, seven hundred twenty-two".