681598134 has 144 divisors (see below), whose sum is σ = 1832641200. Its totient is φ = 182020608.

The previous prime is 681598129. The next prime is 681598139. The reversal of 681598134 is 431895186.

It is an interprime number because it is at equal distance from previous prime (681598129) and next prime (681598139).

It is a self number, because there is not a number n which added to its sum of digits gives 681598134.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681598139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1491234 + ... + 1491690.

It is an arithmetic number, because the mean of its divisors is an integer number (12726675).

Almost surely, 2^681598134 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681598134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (916320600).

681598134 is an abundant number, since it is smaller than the sum of its proper divisors (1151043066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681598134 is a wasteful number, since it uses less digits than its factorization.

681598134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587 (or 577 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 681598134 is about 26107.4344584067. The cubic root of 681598134 is about 880.0542898669.

The spelling of 681598134 in words is "six hundred eighty-one million, five hundred ninety-eight thousand, one hundred thirty-four".