687465917 has 2 divisors, whose sum is σ = 687465918. Its totient is φ = 687465916.

The previous prime is 687465887. The next prime is 687465937. The reversal of 687465917 is 719564786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 515698681 + 171767236 = 22709^2 + 13106^2 .

It is a cyclic number.

It is not a de Polignac number, because 687465917 - 2⁶ = 687465853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687465937) 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, 343732958 + 343732959.

It is an arithmetic number, because the mean of its divisors is an integer number (343732959).

Almost surely, 2^687465917 is an apocalyptic number.

It is an amenable number.

687465917 is a deficient number, since it is larger than the sum of its proper divisors (1).

687465917 is an equidigital number, since it uses as much as digits as its factorization.

687465917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 53.

The square root of 687465917 is about 26219.5712588898. The cubic root of 687465917 is about 882.5724987587.

The spelling of 687465917 in words is "six hundred eighty-seven million, four hundred sixty-five thousand, nine hundred seventeen".