681123558 has 16 divisors (see below), whose sum is σ = 1362548736. Its totient is φ = 226990920.

The previous prime is 681123473. The next prime is 681123559. The reversal of 681123558 is 855321186.

681123558 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681123559) 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, 25803 + ... + 45033.

It is an arithmetic number, because the mean of its divisors is an integer number (85159296).

Almost surely, 2^681123558 is an apocalyptic number.

681123558 is an abundant number, since it is smaller than the sum of its proper divisors (681425178).

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

681123558 is a wasteful number, since it uses less digits than its factorization.

681123558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25139.

The product of its digits is 57600, while the sum is 39.

The square root of 681123558 is about 26098.3439704515. The cubic root of 681123558 is about 879.8499907869.

The spelling of 681123558 in words is "six hundred eighty-one million, one hundred twenty-three thousand, five hundred fifty-eight".