681540933 has 8 divisors (see below), whose sum is σ = 908918208. Its totient is φ = 454262144.

The previous prime is 681540929. The next prime is 681540947. The reversal of 681540933 is 339045186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681540933 - 2² = 681540929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681540891 and 681540900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681540913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6585 + ... + 37502.

It is an arithmetic number, because the mean of its divisors is an integer number (113614776).

Almost surely, 2^681540933 is an apocalyptic number.

It is an amenable number.

681540933 is a deficient number, since it is larger than the sum of its proper divisors (227377275).

681540933 is a wasteful number, since it uses less digits than its factorization.

681540933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49243.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 681540933 is about 26106.3389428698. The cubic root of 681540933 is about 880.0296705733.

The spelling of 681540933 in words is "six hundred eighty-one million, five hundred forty thousand, nine hundred thirty-three".