681435973 has 16 divisors (see below), whose sum is σ = 754427520. Its totient is φ = 612215296.

The previous prime is 681435943. The next prime is 681435977. The reversal of 681435973 is 379534186.

681435973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 681435973 - 2¹³ = 681427781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681435977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228033 + ... + 231001.

It is an arithmetic number, because the mean of its divisors is an integer number (47151720).

Almost surely, 2^681435973 is an apocalyptic number.

It is an amenable number.

681435973 is a deficient number, since it is larger than the sum of its proper divisors (72991547).

681435973 is a wasteful number, since it uses less digits than its factorization.

681435973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3596.

The product of its digits is 544320, while the sum is 46.

The square root of 681435973 is about 26104.3286257280. The cubic root of 681435973 is about 879.9844922370.

The spelling of 681435973 in words is "six hundred eighty-one million, four hundred thirty-five thousand, nine hundred seventy-three".