1201784645 has 4 divisors (see below), whose sum is σ = 1442141580. Its totient is φ = 961427712.

The previous prime is 1201784609. The next prime is 1201784653. The reversal of 1201784645 is 5464871021.

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 940832929 + 260951716 = 30673^2 + 16154^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201784645 - 2¹⁰ = 1201783621 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1201784599 and 1201784608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120178460 + ... + 120178469.

It is an arithmetic number, because the mean of its divisors is an integer number (360535395).

Almost surely, 2^1201784645 is an apocalyptic number.

It is an amenable number.

1201784645 is a deficient number, since it is larger than the sum of its proper divisors (240356935).

1201784645 is an equidigital number, since it uses as much as digits as its factorization.

1201784645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240356934.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 1201784645 is about 34666.7657129995. The cubic root of 1201784645 is about 1063.1851049973.

The spelling of 1201784645 in words is "one billion, two hundred one million, seven hundred eighty-four thousand, six hundred forty-five".