686838133 has 2 divisors, whose sum is σ = 686838134. Its totient is φ = 686838132.

The previous prime is 686838083. The next prime is 686838143. The reversal of 686838133 is 331838686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 660644209 + 26193924 = 25703^2 + 5118^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686838133 is a prime.

It is a super-3 number, since 3×686838133³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686838143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343419066 + 343419067.

It is an arithmetic number, because the mean of its divisors is an integer number (343419067).

Almost surely, 2^686838133 is an apocalyptic number.

It is an amenable number.

686838133 is a deficient number, since it is larger than the sum of its proper divisors (1).

686838133 is an equidigital number, since it uses as much as digits as its factorization.

686838133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 46.

The square root of 686838133 is about 26207.5968566368. The cubic root of 686838133 is about 882.3037660986.

The spelling of 686838133 in words is "six hundred eighty-six million, eight hundred thirty-eight thousand, one hundred thirty-three".