1923669091889 has 2 divisors, whose sum is σ = 1923669091890. Its totient is φ = 1923669091888.

The previous prime is 1923669091873. The next prime is 1923669092011. The reversal of 1923669091889 is 9881909663291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1821258211600 + 102410880289 = 1349540^2 + 320017^2 .

It is a cyclic number.

It is not a de Polignac number, because 1923669091889 - 2⁴ = 1923669091873 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1923669021889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 961834545944 + 961834545945.

It is an arithmetic number, because the mean of its divisors is an integer number (961834545945).

Almost surely, 2^{1923669091889} is an apocalyptic number.

It is an amenable number.

1923669091889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1923669091889 is an equidigital number, since it uses as much as digits as its factorization.

1923669091889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90699264, while the sum is 71.

The spelling of 1923669091889 in words is "one trillion, nine hundred twenty-three billion, six hundred sixty-nine million, ninety-one thousand, eight hundred eighty-nine".