1231105 has 8 divisors (see below), whose sum is σ = 1555200. Its totient is φ = 932976.

The previous prime is 1231099. The next prime is 1231127. The reversal of 1231105 is 5011321.

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

It is not a de Polignac number, because 1231105 - 2⁵ = 1231073 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6385 + ... + 6574.

It is an arithmetic number, because the mean of its divisors is an integer number (194400).

2^1231105 is an apocalyptic number.

It is an amenable number.

1231105 is a deficient number, since it is larger than the sum of its proper divisors (324095).

1231105 is a wasteful number, since it uses less digits than its factorization.

1231105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12983.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 1231105 is about 1109.5517112780. The cubic root of 1231105 is about 107.1762025311.

Adding to 1231105 its reverse (5011321), we get a palindrome (6242426).

The spelling of 1231105 in words is "one million, two hundred thirty-one thousand, one hundred five".