687450553 has 2 divisors, whose sum is σ = 687450554. Its totient is φ = 687450552.

The previous prime is 687450527. The next prime is 687450559. The reversal of 687450553 is 355054786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 678706704 + 8743849 = 26052^2 + 2957^2 .

It is a cyclic number.

It is not a de Polignac number, because 687450553 - 2⁵ = 687450521 is a prime.

It is not a weakly prime, because it can be changed into another prime (687450559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343725276 + 343725277.

It is an arithmetic number, because the mean of its divisors is an integer number (343725277).

Almost surely, 2^687450553 is an apocalyptic number.

It is an amenable number.

687450553 is a deficient number, since it is larger than the sum of its proper divisors (1).

687450553 is an equidigital number, since it uses as much as digits as its factorization.

687450553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504000, while the sum is 43.

The square root of 687450553 is about 26219.2782700058. The cubic root of 687450553 is about 882.5659239140.

The spelling of 687450553 in words is "six hundred eighty-seven million, four hundred fifty thousand, five hundred fifty-three".