686494049 has 2 divisors, whose sum is σ = 686494050. Its totient is φ = 686494048.

The previous prime is 686494027. The next prime is 686494063. The reversal of 686494049 is 940494686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 657409600 + 29084449 = 25640^2 + 5393^2 .

It is a cyclic number.

It is not a de Polignac number, because 686494049 - 2⁸ = 686493793 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 686493988 and 686494006.

It is not a weakly prime, because it can be changed into another prime (686494069) 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, 343247024 + 343247025.

It is an arithmetic number, because the mean of its divisors is an integer number (343247025).

Almost surely, 2^686494049 is an apocalyptic number.

It is an amenable number.

686494049 is a deficient number, since it is larger than the sum of its proper divisors (1).

686494049 is an equidigital number, since it uses as much as digits as its factorization.

686494049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1492992, while the sum is 50.

The square root of 686494049 is about 26201.0314491625. The cubic root of 686494049 is about 882.1564061388.

The spelling of 686494049 in words is "six hundred eighty-six million, four hundred ninety-four thousand, forty-nine".