681486851 has 4 divisors (see below), whose sum is σ = 717354600. Its totient is φ = 645619104.

The previous prime is 681486823. The next prime is 681486853. The reversal of 681486851 is 158684186.

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

It is a cyclic number.

It is not a de Polignac number, because 681486851 - 2²⁶ = 614377987 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 681486796 and 681486805.

It is not an unprimeable number, because it can be changed into a prime (681486853) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 17933846 + ... + 17933883.

It is an arithmetic number, because the mean of its divisors is an integer number (179338650).

Almost surely, 2^681486851 is an apocalyptic number.

681486851 is a deficient number, since it is larger than the sum of its proper divisors (35867749).

681486851 is a wasteful number, since it uses less digits than its factorization.

681486851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35867748.

The product of its digits is 368640, while the sum is 47.

The square root of 681486851 is about 26105.3031202474. The cubic root of 681486851 is about 880.0063924295.

The spelling of 681486851 in words is "six hundred eighty-one million, four hundred eighty-six thousand, eight hundred fifty-one".