1120721645 has 4 divisors (see below), whose sum is σ = 1344865980. Its totient is φ = 896577312.

The previous prime is 1120721611. The next prime is 1120721653. The reversal of 1120721645 is 5461270211.

1120721645 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 218980804 + 901740841 = 14798^2 + 30029^2 .

It is a cyclic number.

It is not a de Polignac number, because 1120721645 - 2⁸ = 1120721389 is a prime.

It is a super-3 number, since 3×1120721645³ (a number of 28 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112072160 + ... + 112072169.

It is an arithmetic number, because the mean of its divisors is an integer number (336216495).

Almost surely, 2^1120721645 is an apocalyptic number.

It is an amenable number.

1120721645 is a deficient number, since it is larger than the sum of its proper divisors (224144335).

1120721645 is an equidigital number, since it uses as much as digits as its factorization.

1120721645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224144334.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1120721645 is about 33477.1809595730. The cubic root of 1120721645 is about 1038.7218163763.

Adding to 1120721645 its reverse (5461270211), we get a palindrome (6581991856).

The spelling of 1120721645 in words is "one billion, one hundred twenty million, seven hundred twenty-one thousand, six hundred forty-five".