681963219 has 48 divisors (see below), whose sum is σ = 1228980480. Its totient is φ = 369165600.

The previous prime is 681963199. The next prime is 681963223. The reversal of 681963219 is 912369186.

It is a happy number.

681963219 is a `hidden beast` number, since 6 + 8 + 1 + 9 + 632 + 1 + 9 = 666.

It is not a de Polignac number, because 681963219 - 2¹⁵ = 681930451 is a prime.

It is a super-2 number, since 2×681963219² = 930147664137683922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (681963229) 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 47 ways as a sum of consecutive naturals, for example, 21769 + ... + 42869.

It is an arithmetic number, because the mean of its divisors is an integer number (25603760).

Almost surely, 2^681963219 is an apocalyptic number.

681963219 is a deficient number, since it is larger than the sum of its proper divisors (547017261).

681963219 is a wasteful number, since it uses less digits than its factorization.

681963219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21142 (or 21130 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 681963219 is about 26114.4254962655. The cubic root of 681963219 is about 880.2113899020.

The spelling of 681963219 in words is "six hundred eighty-one million, nine hundred sixty-three thousand, two hundred nineteen".