103581209 has 2 divisors, whose sum is σ = 103581210. Its totient is φ = 103581208.

The previous prime is 103581197. The next prime is 103581253. The reversal of 103581209 is 902185301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52243984 + 51337225 = 7228^2 + 7165^2 .

It is an emirp because it is prime and its reverse (902185301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 103581209 - 2²⁴ = 86803993 is a prime.

It is a super-3 number, since 3×103581209³ (a number of 25 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (103581299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51790604 + 51790605.

It is an arithmetic number, because the mean of its divisors is an integer number (51790605).

Almost surely, 2^103581209 is an apocalyptic number.

It is an amenable number.

103581209 is a deficient number, since it is larger than the sum of its proper divisors (1).

103581209 is an equidigital number, since it uses as much as digits as its factorization.

103581209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 103581209 is about 10177.4853966979. The cubic root of 103581209 is about 469.6348589954.

The spelling of 103581209 in words is "one hundred three million, five hundred eighty-one thousand, two hundred nine".