1438211111 has 2 divisors, whose sum is σ = 1438211112. Its totient is φ = 1438211110.

The previous prime is 1438211063. The next prime is 1438211191. The reversal of 1438211111 is 1111128341.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1438211111 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1438211191) 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, 719105555 + 719105556.

It is an arithmetic number, because the mean of its divisors is an integer number (719105556).

Almost surely, 2^1438211111 is an apocalyptic number.

1438211111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1438211111 is an equidigital number, since it uses as much as digits as its factorization.

1438211111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 23.

The square root of 1438211111 is about 37923.7539149278. The cubic root of 1438211111 is about 1128.7754272759.

Adding to 1438211111 its reverse (1111128341), we get a palindrome (2549339452).

The spelling of 1438211111 in words is "one billion, four hundred thirty-eight million, two hundred eleven thousand, one hundred eleven".