1244205161 has 4 divisors (see below), whose sum is σ = 1245004800. Its totient is φ = 1243405524.

The previous prime is 1244205143. The next prime is 1244205191. The reversal of 1244205161 is 1615024421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1615024421 = 7853 ⋅205657.

It is a cyclic number.

It is not a de Polignac number, because 1244205161 - 2⁶ = 1244205097 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 1244205161.

It is not an unprimeable number, because it can be changed into a prime (1244205191) by changing a digit.

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, 397481 + ... + 400598.

It is an arithmetic number, because the mean of its divisors is an integer number (311251200).

Almost surely, 2^1244205161 is an apocalyptic number.

It is an amenable number.

1244205161 is a deficient number, since it is larger than the sum of its proper divisors (799639).

1244205161 is an equidigital number, since it uses as much as digits as its factorization.

1244205161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799638.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 1244205161 is about 35273.2924604438. The cubic root of 1244205161 is about 1075.5501524370.

Adding to 1244205161 its reverse (1615024421), we get a palindrome (2859229582).

The spelling of 1244205161 in words is "one billion, two hundred forty-four million, two hundred five thousand, one hundred sixty-one".