1938161111 has 2 divisors, whose sum is σ = 1938161112. Its totient is φ = 1938161110.

The previous prime is 1938161107. The next prime is 1938161123. The reversal of 1938161111 is 1111618391.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1938161111 - 2² = 1938161107 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 (1938161161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969080555 + 969080556.

It is an arithmetic number, because the mean of its divisors is an integer number (969080556).

Almost surely, 2^1938161111 is an apocalyptic number.

1938161111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938161111 is an equidigital number, since it uses as much as digits as its factorization.

1938161111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 32.

The square root of 1938161111 is about 44024.5512299671. The cubic root of 1938161111 is about 1246.7995161964.

The spelling of 1938161111 in words is "one billion, nine hundred thirty-eight million, one hundred sixty-one thousand, one hundred eleven".