1144209991 has 2 divisors, whose sum is σ = 1144209992. Its totient is φ = 1144209990.

The previous prime is 1144209953. The next prime is 1144210073. The reversal of 1144209991 is 1999024411.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1144209991 - 2¹⁹ = 1143685703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1144209931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572104995 + 572104996.

It is an arithmetic number, because the mean of its divisors is an integer number (572104996).

Almost surely, 2^1144209991 is an apocalyptic number.

1144209991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1144209991 is an equidigital number, since it uses as much as digits as its factorization.

1144209991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 1144209991 is about 33826.1731651690. The cubic root of 1144209991 is about 1045.9282948871.

The spelling of 1144209991 in words is "one billion, one hundred forty-four million, two hundred nine thousand, nine hundred ninety-one".