681111906 has 16 divisors (see below), whose sum is σ = 1366524864. Its totient is φ = 226320464.

The previous prime is 681111889. The next prime is 681111917. The reversal of 681111906 is 609111186.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177150 + ... + 180953.

It is an arithmetic number, because the mean of its divisors is an integer number (85407804).

Almost surely, 2^681111906 is an apocalyptic number.

681111906 is an abundant number, since it is smaller than the sum of its proper divisors (685412958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681111906 is a wasteful number, since it uses less digits than its factorization.

681111906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358425.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 681111906 is about 26098.1207369420. The cubic root of 681111906 is about 879.8449735520.

The spelling of 681111906 in words is "six hundred eighty-one million, one hundred eleven thousand, nine hundred six".