103487821 has 2 divisors, whose sum is σ = 103487822. Its totient is φ = 103487820.

The previous prime is 103487809. The next prime is 103487849. The reversal of 103487821 is 128784301.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102515625 + 972196 = 10125^2 + 986^2 .

It is an emirp because it is prime and its reverse (128784301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 103487821 - 2⁹ = 103487309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103487221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51743910 + 51743911.

It is an arithmetic number, because the mean of its divisors is an integer number (51743911).

Almost surely, 2^103487821 is an apocalyptic number.

It is an amenable number.

103487821 is a deficient number, since it is larger than the sum of its proper divisors (1).

103487821 is an equidigital number, since it uses as much as digits as its factorization.

103487821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 103487821 is about 10172.8963918837. The cubic root of 103487821 is about 469.4936768641.

The spelling of 103487821 in words is "one hundred three million, four hundred eighty-seven thousand, eight hundred twenty-one".