631318285 has 8 divisors (see below), whose sum is σ = 815857560. Its totient is φ = 466204224.

The previous prime is 631318249. The next prime is 631318321. The reversal of 631318285 is 582813136.

It is an interprime number because it is at equal distance from previous prime (631318249) and next prime (631318321).

It can be written as a sum of positive squares in 4 ways, for example, as 85488516 + 545829769 = 9246^2 + 23363^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631318285 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 4856230 + ... + 4856359.

It is an arithmetic number, because the mean of its divisors is an integer number (101982195).

Almost surely, 2^631318285 is an apocalyptic number.

631318285 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

631318285 is a deficient number, since it is larger than the sum of its proper divisors (184539275).

631318285 is a wasteful number, since it uses less digits than its factorization.

631318285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9712607.

The product of its digits is 34560, while the sum is 37.

The square root of 631318285 is about 25126.0479383448. The cubic root of 631318285 is about 857.8594163487.

The spelling of 631318285 in words is "six hundred thirty-one million, three hundred eighteen thousand, two hundred eighty-five".