686047819 has 2 divisors, whose sum is σ = 686047820. Its totient is φ = 686047818.

The previous prime is 686047787. The next prime is 686047823. The reversal of 686047819 is 918740686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686047819 - 2⁵ = 686047787 is a prime.

It is a super-2 number, since 2×686047819² = 941323219909313522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (686047889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343023909 + 343023910.

It is an arithmetic number, because the mean of its divisors is an integer number (343023910).

Almost surely, 2^686047819 is an apocalyptic number.

686047819 is a deficient number, since it is larger than the sum of its proper divisors (1).

686047819 is an equidigital number, since it uses as much as digits as its factorization.

686047819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 686047819 is about 26192.5145604617. The cubic root of 686047819 is about 881.9652270233.

The spelling of 686047819 in words is "six hundred eighty-six million, forty-seven thousand, eight hundred nineteen".