681194873 has 4 divisors (see below), whose sum is σ = 681314640. Its totient is φ = 681075108.

The previous prime is 681194791. The next prime is 681194893. The reversal of 681194873 is 378491186.

681194873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 378491186 = 2 ⋅189245593.

It is a cyclic number.

It is not a de Polignac number, because 681194873 - 2⁸ = 681194617 is a prime.

It is a super-2 number, since 2×681194873² = 928052910002972258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681194893) 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, 50903 + ... + 62876.

It is an arithmetic number, because the mean of its divisors is an integer number (170328660).

Almost surely, 2^681194873 is an apocalyptic number.

It is an amenable number.

681194873 is a deficient number, since it is larger than the sum of its proper divisors (119767).

681194873 is a wasteful number, since it uses less digits than its factorization.

681194873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119766.

The product of its digits is 290304, while the sum is 47.

The square root of 681194873 is about 26099.7102091192. The cubic root of 681194873 is about 879.8806970670.

The spelling of 681194873 in words is "six hundred eighty-one million, one hundred ninety-four thousand, eight hundred seventy-three".