686926459 has 2 divisors, whose sum is σ = 686926460. Its totient is φ = 686926458.

The previous prime is 686926433. The next prime is 686926469. The reversal of 686926459 is 954629686.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686926459 - 2²¹ = 684829307 is a prime.

It is not a weakly prime, because it can be changed into another prime (686926469) 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, 343463229 + 343463230.

It is an arithmetic number, because the mean of its divisors is an integer number (343463230).

Almost surely, 2^686926459 is an apocalyptic number.

686926459 is a deficient number, since it is larger than the sum of its proper divisors (1).

686926459 is an equidigital number, since it uses as much as digits as its factorization.

686926459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 55.

The square root of 686926459 is about 26209.2819245396. The cubic root of 686926459 is about 882.3415853063.

The spelling of 686926459 in words is "six hundred eighty-six million, nine hundred twenty-six thousand, four hundred fifty-nine".