681106198 has 4 divisors (see below), whose sum is σ = 1021659300. Its totient is φ = 340553098.

The previous prime is 681106193. The next prime is 681106201. The reversal of 681106198 is 891601186.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 681106198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681106193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170276548 + ... + 170276551.

It is an arithmetic number, because the mean of its divisors is an integer number (255414825).

Almost surely, 2^681106198 is an apocalyptic number.

681106198 is a deficient number, since it is larger than the sum of its proper divisors (340553102).

681106198 is a wasteful number, since it uses less digits than its factorization.

681106198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340553101.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 681106198 is about 26098.0113801799. The cubic root of 681106198 is about 879.8425157233.

The spelling of 681106198 in words is "six hundred eighty-one million, one hundred six thousand, one hundred ninety-eight".