103666213 has 12 divisors (see below), whose sum is σ = 124751340. Its totient is φ = 85791552.

The previous prime is 103666169. The next prime is 103666217. The reversal of 103666213 is 312666301.

It can be written as a sum of positive squares in 2 ways, for example, as 51581124 + 52085089 = 7182^2 + 7217^2 .

It is not a de Polignac number, because 103666213 - 2¹³ = 103658021 is a prime.

It is a super-2 number, since 2×103666213² = 21493367435522738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103666217) 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 in 11 ways as a sum of consecutive naturals, for example, 35056 + ... + 37897.

It is an arithmetic number, because the mean of its divisors is an integer number (10395945).

Almost surely, 2^103666213 is an apocalyptic number.

It is an amenable number.

103666213 is a deficient number, since it is larger than the sum of its proper divisors (21085127).

103666213 is an equidigital number, since it uses as much as digits as its factorization.

103666213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72996 (or 72989 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 103666213 is about 10181.6606209400. The cubic root of 103666213 is about 469.7632926066.

The spelling of 103666213 in words is "one hundred three million, six hundred sixty-six thousand, two hundred thirteen".