190688489 has 2 divisors, whose sum is σ = 190688490. Its totient is φ = 190688488.

The previous prime is 190688461. The next prime is 190688549. The reversal of 190688489 is 984886091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190219264 + 469225 = 13792^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 190688489 - 2⁸ = 190688233 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 190688489.

It is not a weakly prime, because it can be changed into another prime (190681489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95344244 + 95344245.

It is an arithmetic number, because the mean of its divisors is an integer number (95344245).

Almost surely, 2^190688489 is an apocalyptic number.

It is an amenable number.

190688489 is a deficient number, since it is larger than the sum of its proper divisors (1).

190688489 is an equidigital number, since it uses as much as digits as its factorization.

190688489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 995328, while the sum is 53.

The square root of 190688489 is about 13809.0002896662. Note that the first 3 decimals coincide. The cubic root of 190688489 is about 575.5832659941.

It can be divided in two parts, 1906884 and 89, that multiplied together give a triangular number (169712676 = T₁₈₄₂₃).

The spelling of 190688489 in words is "one hundred ninety million, six hundred eighty-eight thousand, four hundred eighty-nine".