1445911111 has 2 divisors, whose sum is σ = 1445911112. Its totient is φ = 1445911110.

The previous prime is 1445911097. The next prime is 1445911133. The reversal of 1445911111 is 1111195441.

It is a weak prime.

It is an emirp because it is prime and its reverse (1111195441) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1445911111 - 2²³ = 1437522503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1445911111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1445911141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722955555 + 722955556.

It is an arithmetic number, because the mean of its divisors is an integer number (722955556).

Almost surely, 2^1445911111 is an apocalyptic number.

1445911111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1445911111 is an equidigital number, since it uses as much as digits as its factorization.

1445911111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 28.

The square root of 1445911111 is about 38025.1378827217. The cubic root of 1445911111 is about 1130.7862831014.

The spelling of 1445911111 in words is "one billion, four hundred forty-five million, nine hundred eleven thousand, one hundred eleven".