786031681 has 6 divisors (see below), whose sum is σ = 787659782. Its totient is φ = 784406400.

The previous prime is 786031667. The next prime is 786031709. The reversal of 786031681 is 186130687.

786031681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 150185025 + 635846656 = 12255^2 + 25216^2 .

It is a de Polignac number, because none of the positive numbers 2^k-786031681 is a prime.

It is a super-2 number, since 2×786031681² = 1235691607071371522, 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 (786031621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 653881 + ... + 655081.

Almost surely, 2^786031681 is an apocalyptic number.

It is an amenable number.

786031681 is a deficient number, since it is larger than the sum of its proper divisors (1628101).

786031681 is an frugal number, since it uses more digits than its factorization.

786031681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2819 (or 2010 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 786031681 is about 28036.2565439825. The cubic root of 786031681 is about 922.8830795165.

The spelling of 786031681 in words is "seven hundred eighty-six million, thirty-one thousand, six hundred eighty-one".