681144249 has 8 divisors (see below), whose sum is σ = 908781120. Its totient is φ = 453801776.

The previous prime is 681144229. The next prime is 681144263. The reversal of 681144249 is 942441186.

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

It is a cyclic number.

It is not a de Polignac number, because 681144249 - 2⁹ = 681143737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681144229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68142 + ... + 77495.

It is an arithmetic number, because the mean of its divisors is an integer number (113597640).

Almost surely, 2^681144249 is an apocalyptic number.

It is an amenable number.

681144249 is a deficient number, since it is larger than the sum of its proper divisors (227636871).

681144249 is a wasteful number, since it uses less digits than its factorization.

681144249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147199.

The product of its digits is 55296, while the sum is 39.

The square root of 681144249 is about 26098.7403719030. The cubic root of 681144249 is about 879.8588999839.

The spelling of 681144249 in words is "six hundred eighty-one million, one hundred forty-four thousand, two hundred forty-nine".