681963843 has 16 divisors (see below), whose sum is σ = 1013054976. Its totient is φ = 404516640.

The previous prime is 681963829. The next prime is 681963851. The reversal of 681963843 is 348369186.

It is not a de Polignac number, because 681963843 - 2¹⁶ = 681898307 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681963792 and 681963801.

It is not an unprimeable number, because it can be changed into a prime (681963803) 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, 218296 + ... + 221397.

It is an arithmetic number, because the mean of its divisors is an integer number (63315936).

Almost surely, 2^681963843 is an apocalyptic number.

681963843 is a deficient number, since it is larger than the sum of its proper divisors (331091133).

681963843 is a wasteful number, since it uses less digits than its factorization.

681963843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439754.

The product of its digits is 746496, while the sum is 48.

The square root of 681963843 is about 26114.4374436824. The cubic root of 681963843 is about 880.2116583680.

The spelling of 681963843 in words is "six hundred eighty-one million, nine hundred sixty-three thousand, eight hundred forty-three".