686135539 has 2 divisors, whose sum is σ = 686135540. Its totient is φ = 686135538.

The previous prime is 686135501. The next prime is 686135557. The reversal of 686135539 is 935531686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686135539 - 2¹⁵ = 686102771 is a prime.

It is not a weakly prime, because it can be changed into another prime (686135579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343067769 + 343067770.

It is an arithmetic number, because the mean of its divisors is an integer number (343067770).

Almost surely, 2^686135539 is an apocalyptic number.

686135539 is a deficient number, since it is larger than the sum of its proper divisors (1).

686135539 is an equidigital number, since it uses as much as digits as its factorization.

686135539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 46.

The square root of 686135539 is about 26194.1890311573. The cubic root of 686135539 is about 882.0028156045.

The spelling of 686135539 in words is "six hundred eighty-six million, one hundred thirty-five thousand, five hundred thirty-nine".