631640043 has 24 divisors (see below), whose sum is σ = 925408848. Its totient is φ = 415098432.

The previous prime is 631639993. The next prime is 631640063. The reversal of 631640043 is 340046136.

It is not a de Polignac number, because 631640043 - 2⁶ = 631639979 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 631639989 and 631640016.

It is not an unprimeable number, because it can be changed into a prime (631640063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 564921 + ... + 566037.

It is an arithmetic number, because the mean of its divisors is an integer number (38558702).

Almost surely, 2^631640043 is an apocalyptic number.

631640043 is a deficient number, since it is larger than the sum of its proper divisors (293768805).

631640043 is a wasteful number, since it uses less digits than its factorization.

631640043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1963 (or 1960 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 631640043 is about 25132.4499999503. The cubic root of 631640043 is about 858.0051306196.

Adding to 631640043 its reverse (340046136), we get a palindrome (971686179).

The spelling of 631640043 in words is "six hundred thirty-one million, six hundred forty thousand, forty-three".