687275671 has 2 divisors, whose sum is σ = 687275672. Its totient is φ = 687275670.

The previous prime is 687275653. The next prime is 687275717. The reversal of 687275671 is 176572786.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687275671 - 2⁵ = 687275639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687275621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343637835 + 343637836.

It is an arithmetic number, because the mean of its divisors is an integer number (343637836).

Almost surely, 2^687275671 is an apocalyptic number.

687275671 is a deficient number, since it is larger than the sum of its proper divisors (1).

687275671 is an equidigital number, since it uses as much as digits as its factorization.

687275671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 49.

The square root of 687275671 is about 26215.9430690563. The cubic root of 687275671 is about 882.4910782963.

The spelling of 687275671 in words is "six hundred eighty-seven million, two hundred seventy-five thousand, six hundred seventy-one".