1144187911 has 4 divisors (see below), whose sum is σ = 1159861792. Its totient is φ = 1128514032.

The previous prime is 1144187909. The next prime is 1144187917. The reversal of 1144187911 is 1197814411.

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

It is a cyclic number.

It is not a de Polignac number, because 1144187911 - 2¹ = 1144187909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144187917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7836831 + ... + 7836976.

It is an arithmetic number, because the mean of its divisors is an integer number (289965448).

Almost surely, 2^1144187911 is an apocalyptic number.

1144187911 is a deficient number, since it is larger than the sum of its proper divisors (15673881).

1144187911 is an equidigital number, since it uses as much as digits as its factorization.

1144187911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15673880.

The product of its digits is 8064, while the sum is 37.

The square root of 1144187911 is about 33825.8467891049. The cubic root of 1144187911 is about 1045.9215670296.

The spelling of 1144187911 in words is "one billion, one hundred forty-four million, one hundred eighty-seven thousand, nine hundred eleven".