683871981 has 16 divisors (see below), whose sum is σ = 983795904. Its totient is φ = 420061824.

The previous prime is 683871967. The next prime is 683871983. The reversal of 683871981 is 189178386.

683871981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 683871981 - 2¹¹ = 683869933 is a prime.

It is a super-2 number, since 2×683871981² = 935361772793728722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (683871983) 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, 5305 + ... + 37361.

It is an arithmetic number, because the mean of its divisors is an integer number (61487244).

Almost surely, 2^683871981 is an apocalyptic number.

It is an amenable number.

683871981 is a deficient number, since it is larger than the sum of its proper divisors (299923923).

683871981 is a wasteful number, since it uses less digits than its factorization.

683871981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32620.

The product of its digits is 580608, while the sum is 51.

The square root of 683871981 is about 26150.9460823122. The cubic root of 683871981 is about 881.0318393223.

The spelling of 683871981 in words is "six hundred eighty-three million, eight hundred seventy-one thousand, nine hundred eighty-one".