687671597 has 2 divisors, whose sum is σ = 687671598. Its totient is φ = 687671596.

The previous prime is 687671581. The next prime is 687671629. The reversal of 687671597 is 795176786.

687671597 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 379704196 + 307967401 = 19486^2 + 17549^2 .

It is a cyclic number.

It is not a de Polignac number, because 687671597 - 2⁴ = 687671581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687671507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343835798 + 343835799.

It is an arithmetic number, because the mean of its divisors is an integer number (343835799).

Almost surely, 2^687671597 is an apocalyptic number.

It is an amenable number.

687671597 is a deficient number, since it is larger than the sum of its proper divisors (1).

687671597 is an equidigital number, since it uses as much as digits as its factorization.

687671597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4445280, while the sum is 56.

The square root of 687671597 is about 26223.4932264944. The cubic root of 687671597 is about 882.6605076847.

The spelling of 687671597 in words is "six hundred eighty-seven million, six hundred seventy-one thousand, five hundred ninety-seven".