686477489 has 2 divisors, whose sum is σ = 686477490. Its totient is φ = 686477488.

The previous prime is 686477443. The next prime is 686477501. The reversal of 686477489 is 984774686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 449779264 + 236698225 = 21208^2 + 15385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686477489 is a prime.

It is not a weakly prime, because it can be changed into another prime (686477089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343238744 + 343238745.

It is an arithmetic number, because the mean of its divisors is an integer number (343238745).

Almost surely, 2^686477489 is an apocalyptic number.

It is an amenable number.

686477489 is a deficient number, since it is larger than the sum of its proper divisors (1).

686477489 is an equidigital number, since it uses as much as digits as its factorization.

686477489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16257024, while the sum is 59.

The square root of 686477489 is about 26200.7154291634. The cubic root of 686477489 is about 882.1493127889.

The spelling of 686477489 in words is "six hundred eighty-six million, four hundred seventy-seven thousand, four hundred eighty-nine".