686312951 has 2 divisors, whose sum is σ = 686312952. Its totient is φ = 686312950.

The previous prime is 686312867. The next prime is 686313011. The reversal of 686312951 is 159213686.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686312951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 686312899 and 686312908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686312351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343156475 + 343156476.

It is an arithmetic number, because the mean of its divisors is an integer number (343156476).

Almost surely, 2^686312951 is an apocalyptic number.

686312951 is a deficient number, since it is larger than the sum of its proper divisors (1).

686312951 is an equidigital number, since it uses as much as digits as its factorization.

686312951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 41.

The square root of 686312951 is about 26197.5752885644. The cubic root of 686312951 is about 882.0788279908.

The spelling of 686312951 in words is "six hundred eighty-six million, three hundred twelve thousand, nine hundred fifty-one".