190688557 has 2 divisors, whose sum is σ = 190688558. Its totient is φ = 190688556.

The previous prime is 190688549. The next prime is 190688611. The reversal of 190688557 is 755886091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160427556 + 30261001 = 12666^2 + 5501^2 .

It is an emirp because it is prime and its reverse (755886091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 190688557 - 2³ = 190688549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 190688557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190688357) 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, 95344278 + 95344279.

It is an arithmetic number, because the mean of its divisors is an integer number (95344279).

Almost surely, 2^190688557 is an apocalyptic number.

It is an amenable number.

190688557 is a deficient number, since it is larger than the sum of its proper divisors (1).

190688557 is an equidigital number, since it uses as much as digits as its factorization.

190688557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 49.

The square root of 190688557 is about 13809.0027518282. The cubic root of 190688557 is about 575.5833344123.

The spelling of 190688557 in words is "one hundred ninety million, six hundred eighty-eight thousand, five hundred fifty-seven".