686144443 has 2 divisors, whose sum is σ = 686144444. Its totient is φ = 686144442.

The previous prime is 686144423. The next prime is 686144477. The reversal of 686144443 is 344441686.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686144443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 686144396 and 686144405.

It is not a weakly prime, because it can be changed into another prime (686144423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343072221 + 343072222.

It is an arithmetic number, because the mean of its divisors is an integer number (343072222).

Almost surely, 2^686144443 is an apocalyptic number.

686144443 is a deficient number, since it is larger than the sum of its proper divisors (1).

686144443 is an equidigital number, since it uses as much as digits as its factorization.

686144443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 40.

The square root of 686144443 is about 26194.3589919662. The cubic root of 686144443 is about 882.0066308464.

The spelling of 686144443 in words is "six hundred eighty-six million, one hundred forty-four thousand, four hundred forty-three".