681353919 has 6 divisors (see below), whose sum is σ = 984177896. Its totient is φ = 454235940.

The previous prime is 681353903. The next prime is 681353921. The reversal of 681353919 is 919353186.

It is not a de Polignac number, because 681353919 - 2⁴ = 681353903 is a prime.

It is a super-2 number, since 2×681353919² = 928486325873317122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681353989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37852987 + ... + 37853004.

Almost surely, 2^681353919 is an apocalyptic number.

681353919 is a deficient number, since it is larger than the sum of its proper divisors (302823977).

681353919 is a wasteful number, since it uses less digits than its factorization.

681353919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75705997 (or 75705994 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 681353919 is about 26102.7569233596. The cubic root of 681353919 is about 879.9491701873.

The spelling of 681353919 in words is "six hundred eighty-one million, three hundred fifty-three thousand, nine hundred nineteen".