686506867 has 2 divisors, whose sum is σ = 686506868. Its totient is φ = 686506866.

The previous prime is 686506823. The next prime is 686506889. The reversal of 686506867 is 768605686.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686506867 is a prime.

It is not a weakly prime, because it can be changed into another prime (686504867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343253433 + 343253434.

It is an arithmetic number, because the mean of its divisors is an integer number (343253434).

Almost surely, 2^686506867 is an apocalyptic number.

686506867 is a deficient number, since it is larger than the sum of its proper divisors (1).

686506867 is an equidigital number, since it uses as much as digits as its factorization.

686506867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2903040, while the sum is 52.

The square root of 686506867 is about 26201.2760567114. The cubic root of 686506867 is about 882.1618965532.

The spelling of 686506867 in words is "six hundred eighty-six million, five hundred six thousand, eight hundred sixty-seven".