686388013 has 2 divisors, whose sum is σ = 686388014. Its totient is φ = 686388012.

The previous prime is 686388007. The next prime is 686388023. The reversal of 686388013 is 310883686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 650352004 + 36036009 = 25502^2 + 6003^2 .

It is a cyclic number.

It is not a de Polignac number, because 686388013 - 2²⁵ = 652833581 is a prime.

It is a super-2 number, since 2×686388013² = 942257008780176338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686388023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343194006 + 343194007.

It is an arithmetic number, because the mean of its divisors is an integer number (343194007).

Almost surely, 2^686388013 is an apocalyptic number.

It is an amenable number.

686388013 is a deficient number, since it is larger than the sum of its proper divisors (1).

686388013 is an equidigital number, since it uses as much as digits as its factorization.

686388013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 686388013 is about 26199.0078628944. The cubic root of 686388013 is about 882.1109844520.

The spelling of 686388013 in words is "six hundred eighty-six million, three hundred eighty-eight thousand, thirteen".