631131040 has 192 divisors, whose sum is σ = 1646023680. Its totient is φ = 227983360.

The previous prime is 631131023. The next prime is 631131043. The reversal of 631131040 is 40131136.

It is a junction number, because it is equal to n+sod(n) for n = 631130999 and 631131017.

It is not an unprimeable number, because it can be changed into a prime (631131043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7091316 + ... + 7091404.

It is an arithmetic number, because the mean of its divisors is an integer number (8573040).

Almost surely, 2^631131040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631131040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (823011840).

631131040 is an abundant number, since it is smaller than the sum of its proper divisors (1014892640).

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

631131040 is a wasteful number, since it uses less digits than its factorization.

631131040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 631131040 is about 25122.3215487741. The cubic root of 631131040 is about 857.7745960748.

Adding to 631131040 its reverse (40131136), we get a palindrome (671262176).

The spelling of 631131040 in words is "six hundred thirty-one million, one hundred thirty-one thousand, forty".