687599161 has 2 divisors, whose sum is σ = 687599162. Its totient is φ = 687599160.

The previous prime is 687599093. The next prime is 687599167. The reversal of 687599161 is 161995786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 646125561 + 41473600 = 25419^2 + 6440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687599161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 687599099 and 687599108.

It is not a weakly prime, because it can be changed into another prime (687599167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343799580 + 343799581.

It is an arithmetic number, because the mean of its divisors is an integer number (343799581).

Almost surely, 2^687599161 is an apocalyptic number.

It is an amenable number.

687599161 is a deficient number, since it is larger than the sum of its proper divisors (1).

687599161 is an equidigital number, since it uses as much as digits as its factorization.

687599161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 52.

The square root of 687599161 is about 26222.1120621509. The cubic root of 687599161 is about 882.6295148669.

The spelling of 687599161 in words is "six hundred eighty-seven million, five hundred ninety-nine thousand, one hundred sixty-one".