686822501 has 2 divisors, whose sum is σ = 686822502. Its totient is φ = 686822500.

The previous prime is 686822489. The next prime is 686822509. The reversal of 686822501 is 105228686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 640596100 + 46226401 = 25310^2 + 6799^2 .

It is a cyclic number.

It is not a de Polignac number, because 686822501 - 2¹⁰ = 686821477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686822509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343411250 + 343411251.

It is an arithmetic number, because the mean of its divisors is an integer number (343411251).

Almost surely, 2^686822501 is an apocalyptic number.

It is an amenable number.

686822501 is a deficient number, since it is larger than the sum of its proper divisors (1).

686822501 is an equidigital number, since it uses as much as digits as its factorization.

686822501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 686822501 is about 26207.2986208041. The cubic root of 686822501 is about 882.2970724899.

The spelling of 686822501 in words is "six hundred eighty-six million, eight hundred twenty-two thousand, five hundred one".