686992489 has 4 divisors (see below), whose sum is σ = 687112324. Its totient is φ = 686872656.

The previous prime is 686992487. The next prime is 686992507. The reversal of 686992489 is 984299686.

686992489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 984299686 = 2 ⋅492149843.

It can be written as a sum of positive squares in 2 ways, for example, as 142563600 + 544428889 = 11940^2 + 23333^2 .

It is a cyclic number.

It is not a de Polignac number, because 686992489 - 2¹ = 686992487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686992483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50862 + ... + 62935.

It is an arithmetic number, because the mean of its divisors is an integer number (171778081).

Almost surely, 2^686992489 is an apocalyptic number.

It is an amenable number.

686992489 is a deficient number, since it is larger than the sum of its proper divisors (119835).

686992489 is a wasteful number, since it uses less digits than its factorization.

686992489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119834.

The product of its digits is 13436928, while the sum is 61.

The square root of 686992489 is about 26210.5415625088. The cubic root of 686992489 is about 882.3698557504.

The spelling of 686992489 in words is "six hundred eighty-six million, nine hundred ninety-two thousand, four hundred eighty-nine".