1938161 has 2 divisors, whose sum is σ = 1938162. Its totient is φ = 1938160.

The previous prime is 1938149. The next prime is 1938163. The reversal of 1938161 is 1618391.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1547536 + 390625 = 1244^2 + 625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1938161 is a prime.

Together with 1938163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1938163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969080 + 969081.

It is an arithmetic number, because the mean of its divisors is an integer number (969081).

2^1938161 is an apocalyptic number.

It is an amenable number.

1938161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938161 is an equidigital number, since it uses as much as digits as its factorization.

1938161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 29.

The square root of 1938161 is about 1392.1785086691. The cubic root of 1938161 is about 124.6799492395.

The spelling of 1938161 in words is "one million, nine hundred thirty-eight thousand, one hundred sixty-one".