681219473 has 6 divisors (see below), whose sum is σ = 748778562. Its totient is φ = 619290320.

The previous prime is 681219463. The next prime is 681219493. The reversal of 681219473 is 374912186.

It can be written as a sum of positive squares in only one way, i.e., 376088449 + 305131024 = 19393^2 + 17468^2 .

It is not a de Polignac number, because 681219473 - 2¹⁰ = 681218449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681219473.

It is not an unprimeable number, because it can be changed into a prime (681219403) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 2814836 + ... + 2815077.

It is an arithmetic number, because the mean of its divisors is an integer number (124796427).

Almost surely, 2^681219473 is an apocalyptic number.

It is an amenable number.

681219473 is a deficient number, since it is larger than the sum of its proper divisors (67559089).

681219473 is a wasteful number, since it uses less digits than its factorization.

681219473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5629935 (or 5629924 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 681219473 is about 26100.1814744649. The cubic root of 681219473 is about 879.8912886542.

The spelling of 681219473 in words is "six hundred eighty-one million, two hundred nineteen thousand, four hundred seventy-three".