681309385 has 8 divisors (see below), whose sum is σ = 823813056. Its totient is φ = 540886320.

The previous prime is 681309371. The next prime is 681309389. The reversal of 681309385 is 583903186.

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

It is not a de Polignac number, because 681309385 - 2¹¹ = 681307337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681309389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519429 + ... + 520738.

It is an arithmetic number, because the mean of its divisors is an integer number (102976632).

Almost surely, 2^681309385 is an apocalyptic number.

It is an amenable number.

681309385 is a deficient number, since it is larger than the sum of its proper divisors (142503671).

681309385 is a wasteful number, since it uses less digits than its factorization.

681309385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040303.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 681309385 is about 26101.9038577649. The cubic root of 681309385 is about 879.9299983057.

The spelling of 681309385 in words is "six hundred eighty-one million, three hundred nine thousand, three hundred eighty-five".