1213105 has 4 divisors (see below), whose sum is σ = 1455732. Its totient is φ = 970480.

The previous prime is 1213097. The next prime is 1213109. The reversal of 1213105 is 5013121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5013121 = 2239².

It can be written as a sum of positive squares in 2 ways, for example, as 781456 + 431649 = 884^2 + 657^2 .

It is not a de Polignac number, because 1213105 - 2³ = 1213097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121306 + ... + 121315.

It is an arithmetic number, because the mean of its divisors is an integer number (363933).

2^1213105 is an apocalyptic number.

It is an amenable number.

1213105 is a deficient number, since it is larger than the sum of its proper divisors (242627).

1213105 is an equidigital number, since it uses as much as digits as its factorization.

1213105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242626.

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

The square root of 1213105 is about 1101.4104593656. The cubic root of 1213105 is about 106.6512944427.

Adding to 1213105 its reverse (5013121), we get a palindrome (6226226).

The spelling of 1213105 in words is "one million, two hundred thirteen thousand, one hundred five".