1218113 has 4 divisors (see below), whose sum is σ = 1311828. Its totient is φ = 1124400.

The previous prime is 1218089. The next prime is 1218121. The reversal of 1218113 is 3118121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3118121 = 47 ⋅66343.

It can be written as a sum of positive squares in 2 ways, for example, as 744769 + 473344 = 863^2 + 688^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218113 - 2¹⁰ = 1217089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1218091 and 1218100.

It is not an unprimeable number, because it can be changed into a prime (1218313) 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, 46838 + ... + 46863.

It is an arithmetic number, because the mean of its divisors is an integer number (327957).

2^1218113 is an apocalyptic number.

1218113 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1218113 is a deficient number, since it is larger than the sum of its proper divisors (93715).

1218113 is an equidigital number, since it uses as much as digits as its factorization.

1218113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93714.

The product of its digits is 48, while the sum is 17.

The square root of 1218113 is about 1103.6815663949. The cubic root of 1218113 is about 106.7978539970.

It can be divided in two parts, 1218 and 113, that added together give a palindrome (1331).

The spelling of 1218113 in words is "one million, two hundred eighteen thousand, one hundred thirteen".