189691419109 has 2 divisors, whose sum is σ = 189691419110. Its totient is φ = 189691419108.

The previous prime is 189691419097. The next prime is 189691419121. The reversal of 189691419109 is 901914196981.

It is a balanced prime because it is at equal distance from previous prime (189691419097) and next prime (189691419121).

It can be written as a sum of positive squares in only one way, i.e., 164899342084 + 24792077025 = 406078^2 + 157455^2 .

It is a cyclic number.

It is not a de Polignac number, because 189691419109 - 2⁵ = 189691419077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189691419199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94845709554 + 94845709555.

It is an arithmetic number, because the mean of its divisors is an integer number (94845709555).

Almost surely, 2^189691419109 is an apocalyptic number.

It is an amenable number.

189691419109 is a deficient number, since it is larger than the sum of its proper divisors (1).

189691419109 is an equidigital number, since it uses as much as digits as its factorization.

189691419109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1259712, while the sum is 58.

The spelling of 189691419109 in words is "one hundred eighty-nine billion, six hundred ninety-one million, four hundred nineteen thousand, one hundred nine".