687117419 has 4 divisors (see below), whose sum is σ = 687184920. Its totient is φ = 687049920.

The previous prime is 687117413. The next prime is 687117437. The reversal of 687117419 is 914711786.

687117419 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 brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 914711786 = 2 ⋅457355893.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687117419 is a prime.

It is a super-2 number, since 2×687117419² = 944260694986443122, which contains 22 as substring.

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 687117419.

It is not an unprimeable number, because it can be changed into a prime (687117413) 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, 15014 + ... + 39995.

It is an arithmetic number, because the mean of its divisors is an integer number (171796230).

Almost surely, 2^687117419 is an apocalyptic number.

687117419 is a deficient number, since it is larger than the sum of its proper divisors (67501).

687117419 is a wasteful number, since it uses less digits than its factorization.

687117419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67500.

The product of its digits is 84672, while the sum is 44.

The square root of 687117419 is about 26212.9246555969. The cubic root of 687117419 is about 882.4233390060.

The spelling of 687117419 in words is "six hundred eighty-seven million, one hundred seventeen thousand, four hundred nineteen".