681919019 has 8 divisors (see below), whose sum is σ = 718478592. Its totient is φ = 645935400.

The previous prime is 681919009. The next prime is 681919027. The reversal of 681919019 is 910919186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681919019 - 2⁸ = 681918763 is a prime.

It is a super-2 number, since 2×681919019² = 930027096947844722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681919009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141557 + ... + 146294.

It is an arithmetic number, because the mean of its divisors is an integer number (89809824).

Almost surely, 2^681919019 is an apocalyptic number.

681919019 is a deficient number, since it is larger than the sum of its proper divisors (36559573).

681919019 is a wasteful number, since it uses less digits than its factorization.

681919019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287977.

The product of its (nonzero) digits is 34992, while the sum is 44.

The square root of 681919019 is about 26113.5792069950. The cubic root of 681919019 is about 880.1923731462.

The spelling of 681919019 in words is "six hundred eighty-one million, nine hundred nineteen thousand, nineteen".