686128969 has 8 divisors (see below), whose sum is σ = 723076640. Its totient is φ = 649264896.

The previous prime is 686128957. The next prime is 686128979. The reversal of 686128969 is 969821686.

It is a Cunningham number, because it is equal to 882³+1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686128969 is a prime.

It is a super-2 number, since 2×686128969² = 941545924202005922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686128909) 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 in 7 ways as a sum of consecutive naturals, for example, 3672 + ... + 37225.

It is an arithmetic number, because the mean of its divisors is an integer number (90384580).

Almost surely, 2^686128969 is an apocalyptic number.

It is an amenable number.

686128969 is a deficient number, since it is larger than the sum of its proper divisors (36947671).

686128969 is a wasteful number, since it uses less digits than its factorization.

686128969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41799.

The product of its digits is 2239488, while the sum is 55.

The square root of 686128969 is about 26194.0636213628. The cubic root of 686128969 is about 882.0000004285. Note that the first 6 decimals are identical.

The spelling of 686128969 in words is "six hundred eighty-six million, one hundred twenty-eight thousand, nine hundred sixty-nine".