681281513949 has 8 divisors (see below), whose sum is σ = 923266751392. Its totient is φ = 446741976240.

The previous prime is 681281513903. The next prime is 681281513963. The reversal of 681281513949 is 949315182186.

It is a happy number.

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

It is not a de Polignac number, because 681281513949 - 2¹⁷ = 681281382877 is a prime.

It is a super-3 number, since 3×681281513949³ (a number of 36 digits) contains 333 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 (681281513999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1861424719 + ... + 1861425084.

It is an arithmetic number, because the mean of its divisors is an integer number (115408343924).

Almost surely, 2^681281513949 is an apocalyptic number.

It is an amenable number.

681281513949 is a deficient number, since it is larger than the sum of its proper divisors (241985237443).

681281513949 is a wasteful number, since it uses less digits than its factorization.

681281513949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3722849867.

The product of its digits is 3732480, while the sum is 57.

The spelling of 681281513949 in words is "six hundred eighty-one billion, two hundred eighty-one million, five hundred thirteen thousand, nine hundred forty-nine".