681735523 has 16 divisors (see below), whose sum is σ = 830027520. Its totient is φ = 546911136.

The previous prime is 681735511. The next prime is 681735563. The reversal of 681735523 is 325537186.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681735523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681735563) 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, 19840 + ... + 41917.

It is an arithmetic number, because the mean of its divisors is an integer number (51876720).

Almost surely, 2^681735523 is an apocalyptic number.

681735523 is a deficient number, since it is larger than the sum of its proper divisors (148291997).

681735523 is a wasteful number, since it uses less digits than its factorization.

681735523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61866.

The product of its digits is 151200, while the sum is 40.

The square root of 681735523 is about 26110.0655495156. The cubic root of 681735523 is about 880.1134164254.

The spelling of 681735523 in words is "six hundred eighty-one million, seven hundred thirty-five thousand, five hundred twenty-three".