681322761 has 24 divisors (see below), whose sum is σ = 1125933120. Its totient is φ = 388908576.

The previous prime is 681322751. The next prime is 681322823. The reversal of 681322761 is 167223186.

It is not a de Polignac number, because 681322761 - 2⁷ = 681322633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681322751) 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 23 ways as a sum of consecutive naturals, for example, 58891 + ... + 69503.

It is an arithmetic number, because the mean of its divisors is an integer number (46913880).

Almost surely, 2^681322761 is an apocalyptic number.

It is an amenable number.

681322761 is a deficient number, since it is larger than the sum of its proper divisors (444610359).

681322761 is a wasteful number, since it uses less digits than its factorization.

681322761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11645 (or 11642 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 681322761 is about 26102.1600830276. The cubic root of 681322761 is about 879.9357567598.

The spelling of 681322761 in words is "six hundred eighty-one million, three hundred twenty-two thousand, seven hundred sixty-one".