631045506 has 64 divisors (see below), whose sum is σ = 1556287488. Its totient is φ = 166114368.

The previous prime is 631045501. The next prime is 631045543. The reversal of 631045506 is 605540136.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (631045501) 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, 483651 + ... + 484953.

It is an arithmetic number, because the mean of its divisors is an integer number (24316992).

Almost surely, 2^631045506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631045506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (778143744).

631045506 is an abundant number, since it is smaller than the sum of its proper divisors (925241982).

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

631045506 is a wasteful number, since it uses less digits than its factorization.

631045506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 631045506 is about 25120.6191404591. The cubic root of 631045506 is about 857.7358443722.

The spelling of 631045506 in words is "six hundred thirty-one million, forty-five thousand, five hundred six".