202123189 has 2 divisors, whose sum is σ = 202123190. Its totient is φ = 202123188.

The previous prime is 202123157. The next prime is 202123199. The reversal of 202123189 is 981321202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202123089 + 100 = 14217^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 202123189 - 2⁵ = 202123157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202123139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101061594 + 101061595.

It is an arithmetic number, because the mean of its divisors is an integer number (101061595).

Almost surely, 2^202123189 is an apocalyptic number.

It is an amenable number.

202123189 is a deficient number, since it is larger than the sum of its proper divisors (1).

202123189 is an equidigital number, since it uses as much as digits as its factorization.

202123189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 202123189 is about 14217.0035169159. The cubic root of 202123189 is about 586.8656816985.

The spelling of 202123189 in words is "two hundred two million, one hundred twenty-three thousand, one hundred eighty-nine".