686272771 has 2 divisors, whose sum is σ = 686272772. Its totient is φ = 686272770.

The previous prime is 686272687. The next prime is 686272777. The reversal of 686272771 is 177272686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686272771 - 2⁹ = 686272259 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (686272777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343136385 + 343136386.

It is an arithmetic number, because the mean of its divisors is an integer number (343136386).

Almost surely, 2^686272771 is an apocalyptic number.

686272771 is a deficient number, since it is larger than the sum of its proper divisors (1).

686272771 is an equidigital number, since it uses as much as digits as its factorization.

686272771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 46.

The square root of 686272771 is about 26196.8084124765. The cubic root of 686272771 is about 882.0616139686.

The spelling of 686272771 in words is "six hundred eighty-six million, two hundred seventy-two thousand, seven hundred seventy-one".