1261105 has 8 divisors (see below), whose sum is σ = 1520064. Its totient is φ = 1004400.

The previous prime is 1261081. The next prime is 1261109. The reversal of 1261105 is 5011621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1261105 - 2¹¹ = 1259057 is a prime.

It is a Duffinian number.

1261105 is a lucky 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1150 + ... + 1960.

It is an arithmetic number, because the mean of its divisors is an integer number (190008).

2^1261105 is an apocalyptic number.

It is an amenable number.

1261105 is a deficient number, since it is larger than the sum of its proper divisors (258959).

1261105 is an equidigital number, since it uses as much as digits as its factorization.

1261105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1261105 is about 1122.9893142858. The cubic root of 1261105 is about 108.0397944345.

Adding to 1261105 its reverse (5011621), we get a palindrome (6272726).

The spelling of 1261105 in words is "one million, two hundred sixty-one thousand, one hundred five".