1244205155 has 4 divisors (see below), whose sum is σ = 1493046192. Its totient is φ = 995364120.

The previous prime is 1244205143. The next prime is 1244205191. The reversal of 1244205155 is 5515024421.

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

It is not a de Polignac number, because 1244205155 - 2¹⁰ = 1244204131 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124420511 + ... + 124420520.

It is an arithmetic number, because the mean of its divisors is an integer number (373261548).

Almost surely, 2^1244205155 is an apocalyptic number.

1244205155 is a deficient number, since it is larger than the sum of its proper divisors (248841037).

1244205155 is an equidigital number, since it uses as much as digits as its factorization.

1244205155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248841036.

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 1244205155 is about 35273.2923753936. The cubic root of 1244205155 is about 1075.5501507081.

Adding to 1244205155 its reverse (5515024421), we get a palindrome (6759229576).

The spelling of 1244205155 in words is "one billion, two hundred forty-four million, two hundred five thousand, one hundred fifty-five".