687600841 has 2 divisors, whose sum is σ = 687600842. Its totient is φ = 687600840.
The previous prime is 687600839. The next prime is 687600857. The reversal of 687600841 is 148006786.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 561690000 + 125910841 = 23700^2 + 11221^2 .
It is a cyclic number.
It is not a de Polignac number, because 687600841 - 21 = 687600839 is a prime.
Together with 687600839, it forms a pair of twin primes.
It is a junction number, because it is equal to n+sod(n) for n = 687600794 and 687600803.
It is not a weakly prime, because it can be changed into another prime (687600821) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343800420 + 343800421.
It is an arithmetic number, because the mean of its divisors is an integer number (343800421).
Almost surely, 2687600841 is an apocalyptic number.
It is an amenable number.
687600841 is a deficient number, since it is larger than the sum of its proper divisors (1).
687600841 is an equidigital number, since it uses as much as digits as its factorization.
687600841 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 64512, while the sum is 40.
The square root of 687600841 is about 26222.1440961642. The cubic root of 687600841 is about 882.6302337045.
The spelling of 687600841 in words is "six hundred eighty-seven million, six hundred thousand, eight hundred forty-one".
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