686351 has 4 divisors (see below), whose sum is σ = 690000. Its totient is φ = 682704.

The previous prime is 686339. The next prime is 686353. The reversal of 686351 is 153686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1526 + ... + 1923.

It is an arithmetic number, because the mean of its divisors is an integer number (172500).

2⁶⁸⁶³⁵¹ is an apocalyptic number.

686351 is the 371-st centered decagonal number.

686351 is a deficient number, since it is larger than the sum of its proper divisors (3649).

686351 is a wasteful number, since it uses less digits than its factorization.

686351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3648.

The product of its digits is 4320, while the sum is 29.

The square root of 686351 is about 828.4630347819. The cubic root of 686351 is about 88.2095128425.

The spelling of 686351 in words is "six hundred eighty-six thousand, three hundred fifty-one".