189609918493 has 2 divisors, whose sum is σ = 189609918494. Its totient is φ = 189609918492.

The previous prime is 189609918481. The next prime is 189609918497. The reversal of 189609918493 is 394819906981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189158015929 + 451902564 = 434923^2 + 21258^2 .

It is a cyclic number.

It is not a de Polignac number, because 189609918493 - 2¹⁷ = 189609787421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189609918497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94804959246 + 94804959247.

It is an arithmetic number, because the mean of its divisors is an integer number (94804959247).

Almost surely, 2^189609918493 is an apocalyptic number.

It is an amenable number.

189609918493 is a deficient number, since it is larger than the sum of its proper divisors (1).

189609918493 is an equidigital number, since it uses as much as digits as its factorization.

189609918493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30233088, while the sum is 67.

The spelling of 189609918493 in words is "one hundred eighty-nine billion, six hundred nine million, nine hundred eighteen thousand, four hundred ninety-three".