661103 has 2 divisors, whose sum is σ = 661104. Its totient is φ = 661102.

The previous prime is 661099. The next prime is 661109. The reversal of 661103 is 301166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661103 - 2² = 661099 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661109) 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, 330551 + 330552.

It is an arithmetic number, because the mean of its divisors is an integer number (330552).

2⁶⁶¹¹⁰³ is an apocalyptic number.

661103 is a deficient number, since it is larger than the sum of its proper divisors (1).

661103 is an equidigital number, since it uses as much as digits as its factorization.

661103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 661103 is about 813.0824066477. The cubic root of 661103 is about 87.1143517674.

Adding to 661103 its reverse (301166), we get a palindrome (962269).

The spelling of 661103 in words is "six hundred sixty-one thousand, one hundred three".