681848321 has 16 divisors (see below), whose sum is σ = 873075840. Its totient is φ = 516948480.

The previous prime is 681848311. The next prime is 681848329. The reversal of 681848321 is 123848186.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681848321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681848329) 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, 116816 + ... + 122513.

It is an arithmetic number, because the mean of its divisors is an integer number (54567240).

Almost surely, 2^681848321 is an apocalyptic number.

It is an amenable number.

681848321 is a deficient number, since it is larger than the sum of its proper divisors (191227519).

681848321 is a wasteful number, since it uses less digits than its factorization.

681848321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239384.

The product of its digits is 73728, while the sum is 41.

The square root of 681848321 is about 26112.2255083706. The cubic root of 681848321 is about 880.1619540939.

The spelling of 681848321 in words is "six hundred eighty-one million, eight hundred forty-eight thousand, three hundred twenty-one".