686905501 has 2 divisors, whose sum is σ = 686905502. Its totient is φ = 686905500.

The previous prime is 686905487. The next prime is 686905523. The reversal of 686905501 is 105509686.

686905501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 453732601 + 233172900 = 21301^2 + 15270^2 .

It is a cyclic number.

It is not a de Polignac number, because 686905501 - 2⁹ = 686904989 is a prime.

It is a super-2 number, since 2×686905501² = 943678334608122002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686905561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343452750 + 343452751.

It is an arithmetic number, because the mean of its divisors is an integer number (343452751).

Almost surely, 2^686905501 is an apocalyptic number.

It is an amenable number.

686905501 is a deficient number, since it is larger than the sum of its proper divisors (1).

686905501 is an equidigital number, since it uses as much as digits as its factorization.

686905501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 686905501 is about 26208.8821013030. The cubic root of 686905501 is about 882.3326118552.

The spelling of 686905501 in words is "six hundred eighty-six million, nine hundred five thousand, five hundred one".