631565045 has 32 divisors (see below), whose sum is σ = 835492320. Its totient is φ = 456171520.

The previous prime is 631565029. The next prime is 631565047. The reversal of 631565045 is 540565136.

It can be written as a sum of positive squares in 16 ways, for example, as 6265009 + 625300036 = 2503^2 + 25006^2 .

It is not a de Polignac number, because 631565045 - 2⁴ = 631565029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 631564996 and 631565014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631565047) 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 31 ways as a sum of consecutive naturals, for example, 425705 + ... + 427185.

It is an arithmetic number, because the mean of its divisors is an integer number (26109135).

Almost surely, 2^631565045 is an apocalyptic number.

It is an amenable number.

631565045 is a deficient number, since it is larger than the sum of its proper divisors (203927275).

631565045 is a wasteful number, since it uses less digits than its factorization.

631565045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 631565045 is about 25130.9579005656. The cubic root of 631565045 is about 857.9711707630.

Subtracting from 631565045 its reverse (540565136), we obtain a palindrome (90999909).

The spelling of 631565045 in words is "six hundred thirty-one million, five hundred sixty-five thousand, forty-five".