681198811 has 4 divisors (see below), whose sum is σ = 717051400. Its totient is φ = 645346224.

The previous prime is 681198809. The next prime is 681198827. The reversal of 681198811 is 118891186.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 681198811 - 2¹ = 681198809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681198851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17926266 + ... + 17926303.

It is an arithmetic number, because the mean of its divisors is an integer number (179262850).

Almost surely, 2^681198811 is an apocalyptic number.

681198811 is a deficient number, since it is larger than the sum of its proper divisors (35852589).

681198811 is a wasteful number, since it uses less digits than its factorization.

681198811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35852588.

The product of its digits is 27648, while the sum is 43.

The square root of 681198811 is about 26099.7856504608. The cubic root of 681198811 is about 879.8823925992.

The spelling of 681198811 in words is "six hundred eighty-one million, one hundred ninety-eight thousand, eight hundred eleven".