1121242145 has 8 divisors (see below), whose sum is σ = 1350084456. Its totient is φ = 893931136.

The previous prime is 1121242141. The next prime is 1121242151. The reversal of 1121242145 is 5412421211.

It can be written as a sum of positive squares in 4 ways, for example, as 238023184 + 883218961 = 15428^2 + 29719^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1121242145 - 2² = 1121242141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121242145.

It is not an unprimeable number, because it can be changed into a prime (1121242141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381212 + ... + 384141.

It is an arithmetic number, because the mean of its divisors is an integer number (168760557).

Almost surely, 2^1121242145 is an apocalyptic number.

It is an amenable number.

1121242145 is a deficient number, since it is larger than the sum of its proper divisors (228842311).

1121242145 is an equidigital number, since it uses as much as digits as its factorization.

1121242145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765651.

The product of its digits is 640, while the sum is 23.

The square root of 1121242145 is about 33484.9540092263. The cubic root of 1121242145 is about 1038.8825970156.

Adding to 1121242145 its reverse (5412421211), we get a palindrome (6533663356).

The spelling of 1121242145 in words is "one billion, one hundred twenty-one million, two hundred forty-two thousand, one hundred forty-five".