1200243453505 has 4 divisors (see below), whose sum is σ = 1440292144212. Its totient is φ = 960194762800.

The previous prime is 1200243453473. The next prime is 1200243453527. The reversal of 1200243453505 is 5053543420021.

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 169935221824 + 1030308231681 = 412232^2 + 1015041^2 .

It is not a de Polignac number, because 1200243453505 - 2⁵ = 1200243453473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120024345346 + ... + 120024345355.

It is an arithmetic number, because the mean of its divisors is an integer number (360073036053).

Almost surely, 2^{1200243453505} is an apocalyptic number.

It is an amenable number.

1200243453505 is a deficient number, since it is larger than the sum of its proper divisors (240048690707).

1200243453505 is an equidigital number, since it uses as much as digits as its factorization.

1200243453505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240048690706.

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 1200243453505 its reverse (5053543420021), we get a palindrome (6253786873526).

The spelling of 1200243453505 in words is "one trillion, two hundred billion, two hundred forty-three million, four hundred fifty-three thousand, five hundred five".