681843459 has 16 divisors (see below), whose sum is σ = 1005744384. Its totient is φ = 407416800.

The previous prime is 681843457. The next prime is 681843473. The reversal of 681843459 is 954348186.

It is not a de Polignac number, because 681843459 - 2¹ = 681843457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681843457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143164 + ... + 147849.

It is an arithmetic number, because the mean of its divisors is an integer number (62859024).

Almost surely, 2^681843459 is an apocalyptic number.

681843459 is a deficient number, since it is larger than the sum of its proper divisors (323900925).

681843459 is a wasteful number, since it uses less digits than its factorization.

681843459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291098.

The product of its digits is 829440, while the sum is 48.

The square root of 681843459 is about 26112.1324100503. The cubic root of 681843459 is about 880.1598620560.

The spelling of 681843459 in words is "six hundred eighty-one million, eight hundred forty-three thousand, four hundred fifty-nine".