687601181 has 2 divisors, whose sum is σ = 687601182. Its totient is φ = 687601180.

The previous prime is 687601151. The next prime is 687601183. The reversal of 687601181 is 181106786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 665124100 + 22477081 = 25790^2 + 4741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687601181 is a prime.

It is a super-2 number, since 2×687601181² = 945590768225189522, which contains 22 as substring.

Together with 687601183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687601183) 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, 343800590 + 343800591.

It is an arithmetic number, because the mean of its divisors is an integer number (343800591).

Almost surely, 2^687601181 is an apocalyptic number.

It is an amenable number.

687601181 is a deficient number, since it is larger than the sum of its proper divisors (1).

687601181 is an equidigital number, since it uses as much as digits as its factorization.

687601181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 687601181 is about 26222.1505792336. The cubic root of 687601181 is about 882.6303791834.

The spelling of 687601181 in words is "six hundred eighty-seven million, six hundred one thousand, one hundred eighty-one".