686892049 has 2 divisors, whose sum is σ = 686892050. Its totient is φ = 686892048.

The previous prime is 686892043. The next prime is 686892053. The reversal of 686892049 is 940298686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 559653649 + 127238400 = 23657^2 + 11280^2 .

It is a cyclic number.

It is not a de Polignac number, because 686892049 - 2²¹ = 684794897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 686891987 and 686892005.

It is not a weakly prime, because it can be changed into another prime (686892043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343446024 + 343446025.

It is an arithmetic number, because the mean of its divisors is an integer number (343446025).

Almost surely, 2^686892049 is an apocalyptic number.

It is an amenable number.

686892049 is a deficient number, since it is larger than the sum of its proper divisors (1).

686892049 is an equidigital number, since it uses as much as digits as its factorization.

686892049 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 52.

The square root of 686892049 is about 26208.6254694900. The cubic root of 686892049 is about 882.3268521033.

The spelling of 686892049 in words is "six hundred eighty-six million, eight hundred ninety-two thousand, forty-nine".