681326849 has 4 divisors (see below), whose sum is σ = 778659264. Its totient is φ = 583994436.

The previous prime is 681326839. The next prime is 681326851. The reversal of 681326849 is 948623186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 681326849 - 2¹⁶ = 681261313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681326839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48666197 + ... + 48666210.

It is an arithmetic number, because the mean of its divisors is an integer number (194664816).

Almost surely, 2^681326849 is an apocalyptic number.

It is an amenable number.

681326849 is a deficient number, since it is larger than the sum of its proper divisors (97332415).

681326849 is an equidigital number, since it uses as much as digits as its factorization.

681326849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97332414.

The product of its digits is 497664, while the sum is 47.

The square root of 681326849 is about 26102.2383906055. The cubic root of 681326849 is about 879.9375166551.

The spelling of 681326849 in words is "six hundred eighty-one million, three hundred twenty-six thousand, eight hundred forty-nine".