631044021 has 16 divisors (see below), whose sum is σ = 853160960. Its totient is φ = 414825840.

The previous prime is 631044019. The next prime is 631044053. The reversal of 631044021 is 120440136.

It is not a de Polignac number, because 631044021 - 2¹ = 631044019 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631042021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264966 + ... + 267336.

It is an arithmetic number, because the mean of its divisors is an integer number (53322560).

Almost surely, 2^631044021 is an apocalyptic number.

It is an amenable number.

631044021 is a deficient number, since it is larger than the sum of its proper divisors (222116939).

631044021 is a wasteful number, since it uses less digits than its factorization.

631044021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3576.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 631044021 is about 25120.5895830492. The cubic root of 631044021 is about 857.7351715530.

Adding to 631044021 its reverse (120440136), we get a palindrome (751484157).

The spelling of 631044021 in words is "six hundred thirty-one million, forty-four thousand, twenty-one".