1144121491 has 2 divisors, whose sum is σ = 1144121492. Its totient is φ = 1144121490.

The previous prime is 1144121479. The next prime is 1144121519. The reversal of 1144121491 is 1941214411.

It is an a-pointer prime, because the next prime (1144121519) can be obtained adding 1144121491 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1144121491 is a prime.

It is not a weakly prime, because it can be changed into another prime (1144121191) 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 as a sum of consecutive naturals, namely, 572060745 + 572060746.

It is an arithmetic number, because the mean of its divisors is an integer number (572060746).

Almost surely, 2^1144121491 is an apocalyptic number.

1144121491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1144121491 is an equidigital number, since it uses as much as digits as its factorization.

1144121491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 28.

The square root of 1144121491 is about 33824.8649812531. The cubic root of 1144121491 is about 1045.9013280886.

The spelling of 1144121491 in words is "one billion, one hundred forty-four million, one hundred twenty-one thousand, four hundred ninety-one".