1261103 has 4 divisors (see below), whose sum is σ = 1266840. Its totient is φ = 1255368.

The previous prime is 1261081. The next prime is 1261109. The reversal of 1261103 is 3011621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1261103 - 2¹⁶ = 1195567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261109) 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 3 ways as a sum of consecutive naturals, for example, 2525 + ... + 2982.

It is an arithmetic number, because the mean of its divisors is an integer number (316710).

2^1261103 is an apocalyptic number.

1261103 is a deficient number, since it is larger than the sum of its proper divisors (5737).

1261103 is an equidigital number, since it uses as much as digits as its factorization.

1261103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5736.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1261103 is about 1122.9884238050. The cubic root of 1261103 is about 108.0397373206.

Adding to 1261103 its reverse (3011621), we get a palindrome (4272724).

The spelling of 1261103 in words is "one million, two hundred sixty-one thousand, one hundred three".