1111945 has 4 divisors (see below), whose sum is σ = 1334340. Its totient is φ = 889552.

The previous prime is 1111933. The next prime is 1111949. The reversal of 1111945 is 5491111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5491111 = 233 ⋅23567.

It can be written as a sum of positive squares in 2 ways, for example, as 344569 + 767376 = 587^2 + 876^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111945 - 2⁹ = 1111433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1111949) 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 3 ways as a sum of consecutive naturals, for example, 111190 + ... + 111199.

It is an arithmetic number, because the mean of its divisors is an integer number (333585).

2^1111945 is an apocalyptic number.

It is an amenable number.

1111945 is a deficient number, since it is larger than the sum of its proper divisors (222395).

1111945 is an equidigital number, since it uses as much as digits as its factorization.

1111945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222394.

The product of its digits is 180, while the sum is 22.

The square root of 1111945 is about 1054.4880274332. The cubic root of 1111945 is about 103.6003212524.

The spelling of 1111945 in words is "one million, one hundred eleven thousand, nine hundred forty-five".