681548199 has 4 divisors (see below), whose sum is σ = 908730936. Its totient is φ = 454365464.

The previous prime is 681548171. The next prime is 681548233. The reversal of 681548199 is 991845186.

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 681548199 - 2⁹ = 681547687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681548129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113591364 + ... + 113591369.

It is an arithmetic number, because the mean of its divisors is an integer number (227182734).

Almost surely, 2^681548199 is an apocalyptic number.

681548199 is a deficient number, since it is larger than the sum of its proper divisors (227182737).

681548199 is a wasteful number, since it uses less digits than its factorization.

681548199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227182736.

The product of its digits is 622080, while the sum is 51.

The square root of 681548199 is about 26106.4781041028. The cubic root of 681548199 is about 880.0327979339.

The spelling of 681548199 in words is "six hundred eighty-one million, five hundred forty-eight thousand, one hundred ninety-nine".