681305901 has 16 divisors (see below), whose sum is σ = 938141568. Its totient is φ = 439473600.

The previous prime is 681305893. The next prime is 681305921. The reversal of 681305901 is 109503186.

It is not a de Polignac number, because 681305901 - 2³ = 681305893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681305921) 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 15 ways as a sum of consecutive naturals, for example, 3136 + ... + 37046.

It is an arithmetic number, because the mean of its divisors is an integer number (58633848).

Almost surely, 2^681305901 is an apocalyptic number.

It is an amenable number.

681305901 is a deficient number, since it is larger than the sum of its proper divisors (256835667).

681305901 is a wasteful number, since it uses less digits than its factorization.

681305901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34132.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 681305901 is about 26101.8371192527. The cubic root of 681305901 is about 879.9284984088.

The spelling of 681305901 in words is "six hundred eighty-one million, three hundred five thousand, nine hundred one".