2086686709 has 4 divisors (see below), whose sum is σ = 2209433004. Its totient is φ = 1963940416.

The previous prime is 2086686703. The next prime is 2086686713. The reversal of 2086686709 is 9076866802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1607208100 + 479478609 = 40090^2 + 21897^2 .

It is a cyclic number.

It is not a de Polignac number, because 2086686709 - 2¹⁵ = 2086653941 is a prime.

It is a super-2 number, since 2×2086686709² = 8708522843034501362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2086686703) 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, 61373122 + ... + 61373155.

It is an arithmetic number, because the mean of its divisors is an integer number (552358251).

Almost surely, 2^2086686709 is an apocalyptic number.

It is an amenable number.

2086686709 is a deficient number, since it is larger than the sum of its proper divisors (122746295).

2086686709 is a wasteful number, since it uses less digits than its factorization.

2086686709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122746294.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The square root of 2086686709 is about 45680.2660784720. The cubic root of 2086686709 is about 1277.8672795561.

The spelling of 2086686709 in words is "two billion, eighty-six million, six hundred eighty-six thousand, seven hundred nine".