681123573 has 30 divisors (see below), whose sum is σ = 1101791394. Its totient is φ = 419144544.

The previous prime is 681123563. The next prime is 681123629. The reversal of 681123573 is 375321186.

681123573 is a `hidden beast` number, since 6 + 81 + 1 + 2 + 3 + 573 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 74338884 + 606784689 = 8622^2 + 24633^2 .

It is not a de Polignac number, because 681123573 - 2⁹ = 681123061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681123563) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 11190 + ... + 38567.

Almost surely, 2^681123573 is an apocalyptic number.

It is an amenable number.

681123573 is a deficient number, since it is larger than the sum of its proper divisors (420667821).

681123573 is a wasteful number, since it uses less digits than its factorization.

681123573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49795 (or 49773 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 681123573 is about 26098.3442578260. The cubic root of 681123573 is about 879.8499972457.

The spelling of 681123573 in words is "six hundred eighty-one million, one hundred twenty-three thousand, five hundred seventy-three".