687785101 has 2 divisors, whose sum is σ = 687785102. Its totient is φ = 687785100.

The previous prime is 687785093. The next prime is 687785107. The reversal of 687785101 is 101587786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 518655076 + 169130025 = 22774^2 + 13005^2 .

It is a cyclic number.

It is not a de Polignac number, because 687785101 - 2³ = 687785093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687785107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343892550 + 343892551.

It is an arithmetic number, because the mean of its divisors is an integer number (343892551).

Almost surely, 2^687785101 is an apocalyptic number.

It is an amenable number.

687785101 is a deficient number, since it is larger than the sum of its proper divisors (1).

687785101 is an equidigital number, since it uses as much as digits as its factorization.

687785101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94080, while the sum is 43.

The square root of 687785101 is about 26225.6573034881. The cubic root of 687785101 is about 882.7090676791.

The spelling of 687785101 in words is "six hundred eighty-seven million, seven hundred eighty-five thousand, one hundred one".