189819617 has 12 divisors (see below), whose sum is σ = 208925244. Its totient is φ = 172336320.

The previous prime is 189819611. The next prime is 189819647. The reversal of 189819617 is 716918981.

It can be written as a sum of positive squares in 6 ways, for example, as 100781521 + 89038096 = 10039^2 + 9436^2 .

It is not a de Polignac number, because 189819617 - 2⁴ = 189819601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189819611) 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 in 11 ways as a sum of consecutive naturals, for example, 1103 + ... + 19515.

It is an arithmetic number, because the mean of its divisors is an integer number (17410437).

Almost surely, 2^189819617 is an apocalyptic number.

It is an amenable number.

189819617 is a deficient number, since it is larger than the sum of its proper divisors (19105627).

189819617 is a wasteful number, since it uses less digits than its factorization.

189819617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18500 (or 18487 counting only the distinct ones).

The product of its digits is 217728, while the sum is 50.

The square root of 189819617 is about 13777.5040192337. The cubic root of 189819617 is about 574.7077198863.

The spelling of 189819617 in words is "one hundred eighty-nine million, eight hundred nineteen thousand, six hundred seventeen".