681548535 has 48 divisors (see below), whose sum is σ = 1262858688. Its totient is φ = 339187200.

The previous prime is 681548519. The next prime is 681548557. The reversal of 681548535 is 535845186.

681548535 is a `hidden beast` number, since 68 + 1 + 54 + 8 + 535 = 666.

It is not a de Polignac number, because 681548535 - 2⁴ = 681548519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34405 + ... + 50465.

It is an arithmetic number, because the mean of its divisors is an integer number (26309556).

Almost surely, 2^681548535 is an apocalyptic number.

681548535 is a deficient number, since it is larger than the sum of its proper divisors (581310153).

681548535 is a wasteful number, since it uses less digits than its factorization.

681548535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16136 (or 16133 counting only the distinct ones).

The product of its digits is 576000, while the sum is 45.

The square root of 681548535 is about 26106.4845392864. The cubic root of 681548535 is about 880.0329425512.

The spelling of 681548535 in words is "six hundred eighty-one million, five hundred forty-eight thousand, five hundred thirty-five".