2138197 has 2 divisors, whose sum is σ = 2138198. Its totient is φ = 2138196.

The previous prime is 2138189. The next prime is 2138207. The reversal of 2138197 is 7918312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1674436 + 463761 = 1294^2 + 681^2 .

It is a cyclic number.

It is not a de Polignac number, because 2138197 - 2³ = 2138189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2138137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069098 + 1069099.

It is an arithmetic number, because the mean of its divisors is an integer number (1069099).

2^2138197 is an apocalyptic number.

It is an amenable number.

2138197 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138197 is an equidigital number, since it uses as much as digits as its factorization.

2138197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 2138197 is about 1462.2575012630. The cubic root of 2138197 is about 128.8296732489.

The spelling of 2138197 in words is "two million, one hundred thirty-eight thousand, one hundred ninety-seven".