1938191 has 2 divisors, whose sum is σ = 1938192. Its totient is φ = 1938190.

The previous prime is 1938179. The next prime is 1938197. The reversal of 1938191 is 1918391.

It is a strong prime.

It is an emirp because it is prime and its reverse (1918391) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1938191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1938197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969095 + 969096.

It is an arithmetic number, because the mean of its divisors is an integer number (969096).

2^1938191 is an apocalyptic number.

1938191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938191 is an equidigital number, since it uses as much as digits as its factorization.

1938191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 32.

The square root of 1938191 is about 1392.1892831077. The cubic root of 1938191 is about 124.6805925261.

It can be divided in two parts, 19381 and 91, that multiplied together give a palindrome (1763671).

The spelling of 1938191 in words is "one million, nine hundred thirty-eight thousand, one hundred ninety-one".