188081641 has 4 divisors (see below), whose sum is σ = 205179984. Its totient is φ = 170983300.

The previous prime is 188081629. The next prime is 188081669. The reversal of 188081641 is 146180881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 188081641 - 2⁵ = 188081609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 188081641.

It is not an unprimeable number, because it can be changed into a prime (188081611) 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 in 3 ways as a sum of consecutive naturals, for example, 8549155 + ... + 8549176.

It is an arithmetic number, because the mean of its divisors is an integer number (51294996).

Almost surely, 2^188081641 is an apocalyptic number.

188081641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

188081641 is a deficient number, since it is larger than the sum of its proper divisors (17098343).

188081641 is a wasteful number, since it uses less digits than its factorization.

188081641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17098342.

The product of its (nonzero) digits is 12288, while the sum is 37.

The square root of 188081641 is about 13714.2860186012. The cubic root of 188081641 is about 572.9483439002.

It can be divided in two parts, 18808 and 1641, that added together give a square (20449 = 143²).

The spelling of 188081641 in words is "one hundred eighty-eight million, eighty-one thousand, six hundred forty-one".