681385967 has 4 divisors (see below), whose sum is σ = 694242360. Its totient is φ = 668529576.

The previous prime is 681385937. The next prime is 681385987. The reversal of 681385967 is 769583186.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 769583186 = 2 ⋅384791593.

It is a cyclic number.

It is not a de Polignac number, because 681385967 - 2¹⁰ = 681384943 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 12856339 = 681385967 / (6 + 8 + 1 + 3 + 8 + 5 + 9 + 6 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681385907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6428117 + ... + 6428222.

It is an arithmetic number, because the mean of its divisors is an integer number (173560590).

Almost surely, 2^681385967 is an apocalyptic number.

681385967 is a deficient number, since it is larger than the sum of its proper divisors (12856393).

681385967 is a wasteful number, since it uses less digits than its factorization.

681385967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12856392.

The product of its digits is 2177280, while the sum is 53.

The square root of 681385967 is about 26103.3707976575. The cubic root of 681385967 is about 879.9629663306.

The spelling of 681385967 in words is "six hundred eighty-one million, three hundred eighty-five thousand, nine hundred sixty-seven".