686115401 has 2 divisors, whose sum is σ = 686115402. Its totient is φ = 686115400.

The previous prime is 686115377. The next prime is 686115421. The reversal of 686115401 is 104511686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 471932176 + 214183225 = 21724^2 + 14635^2 .

It is a cyclic number.

It is not a de Polignac number, because 686115401 - 2⁶ = 686115337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (686115421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343057700 + 343057701.

It is an arithmetic number, because the mean of its divisors is an integer number (343057701).

Almost surely, 2^686115401 is an apocalyptic number.

It is an amenable number.

686115401 is a deficient number, since it is larger than the sum of its proper divisors (1).

686115401 is an equidigital number, since it uses as much as digits as its factorization.

686115401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 686115401 is about 26193.8046301029. The cubic root of 686115401 is about 881.9941866260.

The spelling of 686115401 in words is "six hundred eighty-six million, one hundred fifteen thousand, four hundred one".