631144553 has 16 divisors (see below), whose sum is σ = 690542160. Its totient is φ = 573371136.

The previous prime is 631144543. The next prime is 631144589. The reversal of 631144553 is 355441136.

It can be written as a sum of positive squares in 8 ways, for example, as 145250704 + 485893849 = 12052^2 + 22043^2 .

It is a de Polignac number, because none of the positive numbers 2^k-631144553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (631144523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221051 + ... + 223887.

It is an arithmetic number, because the mean of its divisors is an integer number (43158885).

Almost surely, 2^631144553 is an apocalyptic number.

It is an amenable number.

631144553 is a deficient number, since it is larger than the sum of its proper divisors (59397607).

631144553 is a wasteful number, since it uses less digits than its factorization.

631144553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3116.

The product of its digits is 21600, while the sum is 32.

The square root of 631144553 is about 25122.5904914282. The cubic root of 631144553 is about 857.7807179019.

Adding to 631144553 its reverse (355441136), we get a palindrome (986585689).

The spelling of 631144553 in words is "six hundred thirty-one million, one hundred forty-four thousand, five hundred fifty-three".