631384245 has 24 divisors (see below), whose sum is σ = 1106703000. Its totient is φ = 332952576.

The previous prime is 631384181. The next prime is 631384261. The reversal of 631384245 is 542483136.

631384245 is a `hidden beast` number, since 6 + 31 + 384 + 245 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 269361 + 631114884 = 519^2 + 25122^2 .

It is not a de Polignac number, because 631384245 - 2⁶ = 631384181 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 74820 + ... + 82829.

It is an arithmetic number, because the mean of its divisors is an integer number (46112625).

Almost surely, 2^631384245 is an apocalyptic number.

It is an amenable number.

631384245 is a deficient number, since it is larger than the sum of its proper divisors (475318755).

631384245 is a wasteful number, since it uses less digits than its factorization.

631384245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157749 (or 157746 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 631384245 is about 25127.3604861314. The cubic root of 631384245 is about 857.8892916314.

The spelling of 631384245 in words is "six hundred thirty-one million, three hundred eighty-four thousand, two hundred forty-five".