686056919 has 2 divisors, whose sum is σ = 686056920. Its totient is φ = 686056918.

The previous prime is 686056859. The next prime is 686056927. The reversal of 686056919 is 919650686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686056919 - 2¹² = 686052823 is a prime.

It is a super-2 number, since 2×686056919² = 941348192215545122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686056999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343028459 + 343028460.

It is an arithmetic number, because the mean of its divisors is an integer number (343028460).

Almost surely, 2^686056919 is an apocalyptic number.

686056919 is a deficient number, since it is larger than the sum of its proper divisors (1).

686056919 is an equidigital number, since it uses as much as digits as its factorization.

686056919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 686056919 is about 26192.6882736385. The cubic root of 686056919 is about 881.9691265805.

The spelling of 686056919 in words is "six hundred eighty-six million, fifty-six thousand, nine hundred nineteen".