1938791011 has 2 divisors, whose sum is σ = 1938791012. Its totient is φ = 1938791010.

The previous prime is 1938790991. The next prime is 1938791069. The reversal of 1938791011 is 1101978391.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1938791011 - 2⁵ = 1938790979 is a prime.

It is not a weakly prime, because it can be changed into another prime (1938791311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969395505 + 969395506.

It is an arithmetic number, because the mean of its divisors is an integer number (969395506).

Almost surely, 2^1938791011 is an apocalyptic number.

1938791011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938791011 is an equidigital number, since it uses as much as digits as its factorization.

1938791011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 40.

The square root of 1938791011 is about 44031.7046115637. The cubic root of 1938791011 is about 1246.9345710079.

The spelling of 1938791011 in words is "one billion, nine hundred thirty-eight million, seven hundred ninety-one thousand, eleven".