1144243561 has 4 divisors (see below), whose sum is σ = 1158029712. Its totient is φ = 1130457412.

The previous prime is 1144243559. The next prime is 1144243567. The reversal of 1144243561 is 1653424411.

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.

It is a cyclic number.

It is not a de Polignac number, because 1144243561 - 2¹ = 1144243559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1144243567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6892951 + ... + 6893116.

It is an arithmetic number, because the mean of its divisors is an integer number (289507428).

Almost surely, 2^1144243561 is an apocalyptic number.

It is an amenable number.

1144243561 is a deficient number, since it is larger than the sum of its proper divisors (13786151).

1144243561 is an equidigital number, since it uses as much as digits as its factorization.

1144243561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13786150.

The product of its digits is 11520, while the sum is 31.

The square root of 1144243561 is about 33826.6693749178. The cubic root of 1144243561 is about 1045.9385236241.

Adding to 1144243561 its reverse (1653424411), we get a palindrome (2797667972).

The spelling of 1144243561 in words is "one billion, one hundred forty-four million, two hundred forty-three thousand, five hundred sixty-one".