686519049 has 4 divisors (see below), whose sum is σ = 915358736. Its totient is φ = 457679364.

The previous prime is 686519023. The next prime is 686519101. The reversal of 686519049 is 940915686.

686519049 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 Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 686519049 - 2¹² = 686514953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686518989 and 686519007.

It is not an unprimeable number, because it can be changed into a prime (686519849) 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, 114419839 + ... + 114419844.

It is an arithmetic number, because the mean of its divisors is an integer number (228839684).

Almost surely, 2^686519049 is an apocalyptic number.

It is an amenable number.

686519049 is a deficient number, since it is larger than the sum of its proper divisors (228839687).

686519049 is a wasteful number, since it uses less digits than its factorization.

686519049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228839686.

The product of its (nonzero) digits is 466560, while the sum is 48.

The square root of 686519049 is about 26201.5085252739. The cubic root of 686519049 is about 882.1671144824.

The spelling of 686519049 in words is "six hundred eighty-six million, five hundred nineteen thousand, forty-nine".