103206661 has 2 divisors, whose sum is σ = 103206662. Its totient is φ = 103206660.

The previous prime is 103206637. The next prime is 103206671. The reversal of 103206661 is 166602301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96157636 + 7049025 = 9806^2 + 2655^2 .

It is a cyclic number.

It is not a de Polignac number, because 103206661 - 2¹¹ = 103204613 is a prime.

It is a super-2 number, since 2×103206661² = 21303229749537842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103206601) 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, 51603330 + 51603331.

It is an arithmetic number, because the mean of its divisors is an integer number (51603331).

Almost surely, 2^103206661 is an apocalyptic number.

It is an amenable number.

103206661 is a deficient number, since it is larger than the sum of its proper divisors (1).

103206661 is an equidigital number, since it uses as much as digits as its factorization.

103206661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 103206661 is about 10159.0679198438. The cubic root of 103206661 is about 469.0681112749.

Adding to 103206661 its reverse (166602301), we get a palindrome (269808962).

The spelling of 103206661 in words is "one hundred three million, two hundred six thousand, six hundred sixty-one".