631782685 has 4 divisors (see below), whose sum is σ = 758139228. Its totient is φ = 505426144.

The previous prime is 631782647. The next prime is 631782689. The reversal of 631782685 is 586287136.

631782685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 112763161 + 519019524 = 10619^2 + 22782^2 .

It is a cyclic number.

It is not a de Polignac number, because 631782685 - 2¹¹ = 631780637 is a prime.

It is a super-2 number, since 2×631782685² = 798298722131618450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631782689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63178264 + ... + 63178273.

It is an arithmetic number, because the mean of its divisors is an integer number (189534807).

Almost surely, 2^631782685 is an apocalyptic number.

It is an amenable number.

631782685 is a deficient number, since it is larger than the sum of its proper divisors (126356543).

631782685 is a wasteful number, since it uses less digits than its factorization.

631782685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126356542.

The product of its digits is 483840, while the sum is 46.

The square root of 631782685 is about 25135.2876450619. The cubic root of 631782685 is about 858.0697129491.

The spelling of 631782685 in words is "six hundred thirty-one million, seven hundred eighty-two thousand, six hundred eighty-five".